1 S2057 port bypass circuit for fibre channel and gigabit ethernet august 8, 2000 / revision c S2057 ? port bypass circuit for fibre channel and gigabit ethernet features ? supports ansi x3t11 1.0625 gbps fcaldisk attach ? ansi x3t11 fibre channel compatible ? ieee 802.3z gigabit ethernet compatible ? 1250 mbps (gigabit ethernet) operation ? fully differential for minimum deterministic jitter accumulation (10 ps nominal) ? ttl bypass select ? high speed lvpecl i/o ? 0.2 w typical power dissipation ? 3.3 v power supply ? 20-pin tssop general description the S2057 is a single channel port bypass circuit (pbc), designed to minimize jitter accumulation by providing a high bandwidth fully differential data path. primary application is in fibre channel arbitrated loop (fc-al) disk arrays to allow hot swapping of fc-al drives. the S2057 is designed to support 1.0625 gbps and 1.25 gbps data rates. the S2057 is a high speed 2:1 multiplexer with 2 modes of operation: normal and bypass. a block diagram is shown in figure 1, and a system diagram showing the S2057 in a single loop of a disk array is shown in figure 2. a disk drive connects on the disk drive input and output ports (ddip/n, ddop/n), while the inp/n and outp/ n ports connect to the upstream and downstream out p/n sel ddi p/n ddo p/n in p/n 1 0 pbc figure 1. S2057 block diagram 1 l e st u oo d d 0n in i 1i d dn i table 1. truth table device specification devices in the loop. normal mode is enabled by setting the sel pin active, which includes the disk in the loop via the ddi/ddo ports. when the disk drive is either absent or non-functional, bypass mode is selected by setting the sel pin inactive. this routes data directly from in to out, bypassing the disk ports. direct attach fibre channel disk drives have an lrc interlock signal designed to directly control the select function. table 1 is a truth table describing the data flow through the S2057. jitter performance the primary ac parameter of importance is determinis- tic jitter accumulation (data eye degradation) inserted by the port bypass circuit. the S2057 utilizes high bandwidth, low skew differential circuitry to provide symmetric rise and fall times and excellent noise immu- nity. this results in a nominal deterministic jitter accu- mulation of 10 ps. for arrays of disk drives greater than 4, it is recom- mended that the S2057 be cascaded with the s2058 (port bypass with repeater) in a ratio of 4:1 to perform clock and data retiming. this insures optimal jitter performance for the disk array system.
2 port bypass circuit for fibre channel and gigabit ethernet S2057 august 8, 2000 / revision c figure 2. functional block diagram pulldown for bypass in absence of disk drive S2057 bypass tx 01 s2058 s2058 optics or copper dual sc or db-9 S2057 disk storage fc-al disk drive lrc interlock e_store tx rx normal 1 0 S2057 normal disk storage fc-al disk drive lrc interlock 01 tx rx e_store
3 S2057 port bypass circuit for fibre channel and gigabit ethernet august 8, 2000 / revision c figure 3. timing waveforms figure 4. differential voltage figure 5. input termination in p/n ddi p/n out p/n ddo p/n t 1, 2, 3 v p - p = 1000mv 500mv single-ended swing S2057 100 0.1 f 0.1 f biased at vcc -0.65v figure 6. output connection backplane S2057 150 150 0.1 f 0.1 f
4 port bypass circuit for fibre channel and gigabit ethernet S2057 august 8, 2000 / revision c e m a n n i pl e v e lo / i# n i pn o i t p i r c s e d p n i n n i . f f i d l c e p v l i6 , 7. t r o p c b p m a e r t s n w o d e h t m o r f s t u p n i l a i t n e r e f f i d p i d d n i d d . f f i d l c e p v l i3 , 4 c b p n o r e t t i m s n a r t l a c o l e h t m o r f t u p n i l a i r e s . t u p n i e v i r d k s i d . 1 t r o p l e sl t ti1 1 e h t f o t u p t u o e h t g n i s u a c e d o m " s s a p y b " e h t s t c e l e s w o l a , h g i h n e h w . t u o r o t r o p t x e n e h t o t e t a g a p o r p o t t r o p s u o i v e r p s u o i v e r p e h t s e t u o r h c i h w e d o m " l a m r o n " s t c e l e s l a n g i s s i h t o t i d d , t u p n i l a c o l e h t s e t u o r d n a o d d , t u p t u o l a c o l e h t o t t r o p . t u o r o t r o p t x e n e h t p o d d n o d d . f f i d l c e p v l o8 1 , 9 1 r e v i e c e r l a c o l e h t g n i v i r d t u p t u o l a i r e s . t u p t u o e v i r d k s i d . 1 t r o p c b p o t g n i d n o p s e r r o c p t u o n t u o . f f i d l c e p v l o4 1 , 5 1. t r o p c b p m a e r t s p u e h t g n i v i r d t u p t u o l a i r e s c c vv 3 . 3 + , 0 1 , 2 , 1 0 2 , 7 1 , 2 1 . l a n i m o n v 3 . 3 . y l p p u s r e w o p d n gd n g , 9 , 8 , 5 6 1 , 3 1 e i d e h t o t d e h c a t t a y l l a c i s i y h p e r a s n i p d n u o r g . d n u o r g . h t a p l a m r e h t e h t f o t r a p t n a t r o p m i n a e r a d n a , e c a f r u s g n i t n u o m e b d l u o h s s n i p d n u o r g l l a , e c n a m r o f r e p l a m r e h t t s e b r o f . e l b i s s o p f i s a i v e l p i t l u m g n i s u , e n a l p d n u o r g a o t d e t c e n n o c table 2. pin assignment and descriptions
5 S2057 port bypass circuit for fibre channel and gigabit ethernet august 8, 2000 / revision c figure 7. S2057 pinout package 20 vcc 19 ddop 18 ddon 17 vcc 16 gnd 15 outp 14 outn 13 gnd 12 vcc 11 sel vcc 1 vcc 2 ddin 3 ddip 4 gnd 5 inn 6 inp 7 gnd 8 gnd 9 vcc 10
6 port bypass circuit for fibre channel and gigabit ethernet S2057 august 8, 2000 / revision c figure 8. S2057 20 tssop (4.4 mm) package
7 S2057 port bypass circuit for fibre channel and gigabit ethernet august 8, 2000 / revision c r e t e m a r a pn o i t p i r c s e dp y tx a ms t i n us n o i t i d n o c t o d d r t o d d f k s i d ( e m i t l l a f d n a e s i r a t a d l a i r e s . ) o d d , s t u p t u o e v i r d 5 8 10 5 3s p e l p m a s a n o d e t s e t % 0 8 o t % 0 2 . s i s a b 1 t o t n i y a l e d n o i t a g a p o r p h g u o r h t w o l f . t u o 0 3 50 0 0 1s p 0 5 . d e s s a p y b s t i u c r i c l l a h t i w y a l e d . d a o l m h o 2 t o t n i y a l e d n o i t a g a p o r p h g u o r h t w o l f . o d d 0 8 50 0 0 1s p s s a p y b r o l a m r o n n i c b p h t i w y a l e d . d a o l m h o 0 5 . e d o m 3 t i d d y a l e d n o i t a g a p o r p h g u o r h t w o l f . t u o o t 0 6 50 0 0 1s p 0 5 . e d o m l a m r o n n i c b p h t i w y a l e d . d a o l m h o t t u o r t t u o f s s a p y b ( e m i t l l a f d n a e s i r a t a d l a i r e s . ) t u o , t u p t u o 2 2 10 0 2s p e l p m a s a n o d e t s e t % 0 8 o t % 0 2 . s i s a b t s m r r e t t i j n o i t a l u m u c c a r e t t i j m o d n a r35s p h t i w d e t a l u m u c c a r e t t i j t u p t u o s m r n i c b p - t u o o t n i m o r f e d o c 7 . 8 2 k e l p m a s a n o d e t s e t . e d o m s s a p y b . s i s a b t j d r e t t i j n o i t a l u m u c c a r e t t i j c i t s i n i m r e t e d0 1 0 3 s p d e t a l u m u c c a r e t t i j t u p t u o c i t s i n i m r e t e d c b p h t o b , t u o o t n i m o r f e d o c 5 . 8 2 k e s l u p t u p n i s p 1 4 9 . d e s s a p y b s e g a t s . s i s a b e l p m a s a n o d e t s e t . h t d i w table 3. ac characteristics (over recommended operating conditions.) r e t e m a r a pn o i t p i r c s e dn i mp y tx a ms t i n us n o i t i d n o c v ) l t i ( h i ) l t t - l e s ( e g a t l o v h g i h t u p n i0 . 27 4 . 3v v ) l t i ( l i ) l t t - l e s ( e g a t l o v w o l t u p n i08 . 0v i ) l t i ( h i ) l t t - l e s ( t n e r r u c h g i h t u p n i0 5a v n i v 4 . 2 = i ) l t i ( l i ) l t t - l e s ( t n e r r u c w o l t u p n i0 0 5 -a v n i v 5 . 0 = v c c e g a t l o v y l p p u s3 1 . 37 4 . 3v v c c % 5 v 0 3 . 3 = i c c t n e r r u c y l p p u s0 50 7a m v , n e p o s t u p t u o c c v = c c x a m p d n o i t a p i s s i d r e w o p8 1 . 05 2 . 0w v , n e p o s t u p t u o c c v = c c x a m d v ) f d ( n i k a e p - o t - k a e p l a i t n e r e f f i d r e v i e c e r n / p i d d & n / p n i , y t i v i t i s n e s t u p n i 0 0 30 0 6 2 v m p - p 1 c d y l l a n r e t n i . d e l p u o c c a v d e s a i b c c v 5 6 . 0 - d v ) o s _ l ( n t u o - o t - k a e p l a i t n e r e f f i d t u p t u o n / p o d d g n i w s e g a t l o v k a e p 0 0 0 10 0 4 10 0 2 2 v m p - p 1 0 5 w v o t c c v 0 . 2 - d v ) t u o ( n t u o - o t - k a e p l a i t n e r e f f i d t u p t u o n / p t u o g n i w s e g a t l o v k a e p 0 0 2 10 0 3 10 0 2 2 v m p - p 1 0 5 w v o t c c v 0 . 2 - table 4. dc characteristics (over recommended operating conditions.)
8 port bypass circuit for fibre channel and gigabit ethernet S2057 august 8, 2000 / revision c r e t e m a r a pn i mp y tx a ms t i n u v ( e g a t l o v y l p p u s r e w o p l t t c c ) 5 . 0 -4 +v v ( e g a t l o v t u p n i c d l c e p p n i ) 5 . 0 - v c c 5 . 0 + v v ( e g a t l o v t u p n i c d l t t p n i ) 5 . 0 -7 4 . 3v t u p t u o h g i h r o f s t u p t u o o t d e i l p p a e g a t l o v c d v ( e t a t s l t t n i ) 5 . 0 - v c c 5 . 0 + v i ( t n e r r u c t u p t u o l t t t u o ) h g i h t u p t u o , c d ( ) 0 5a m i ( t n e r r u c t u p t u o l c e p t u o ) h g i h t u p t u o c d ( , ) 0 5a m t ( s a i b r e d n u e r u t a r e p m e t e s a c c ) 5 5 -5 2 1? c t ( e r u t a r e p m e t e g a r o t s g t s ) 5 6 -0 5 1? c t u p n i m u m i x a m0 0 0 1v r e t e m a r a pn i mp y tx a ms t i n u v ( e g a t l o v y l p p u s r e w o p c c ) 3 1 . 3 +7 4 . 3 +v ) t ( e g n a r e r u t a r e p m e t g n i t a r e p o t n e i b m a00 7? c table 5. absolute maximum ratings 1 table 6. recommended operating conditions 2 1. caution: stresses listed under absolute maximum ratings may be applied to devices one at a time without causing permanent damage. functionality at or above the values listed is not implied. exposure to these values for extended periods may affect device reliability. 2. amcc guarantees the functional and parametric operation of the part under recommended operating conditions (except where specifically noted in the ac and dc parametric tables).
9 S2057 port bypass circuit for fibre channel and gigabit ethernet august 8, 2000 / revision c amcc is a registered trademark of applied micro circuits corporation. copyright ? 2000 applied micro circuits corporation d105/r159 amcc reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the informati on being relied on is current. amcc does not assume any liability arising out of the application or use of any product or circuit described herein, neither do es it convey any license under its patent rights nor the rights of others. amcc reserves the right to ship devices of higher grade in place of those of lower grade. amcc semiconductor products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. applied micro circuits corporation ? 6290 sequence dr., san diego, ca 92121 phone: (619) 450-9333 ? (800) 755-2622 ? fax: (619) 450-9885 http://www.amcc.com c e r t i f i e d i s o 9 0 0 1 grade s ?commercial 2057 a ?20 tssop note: for fibre channel rates (1.062 gbps), this part does not have a speed grade designation. device package speed grade grade s ?commercial 2057 a ?20 tssop 12 ?1.25 gbps (gigabit ethernet) device package speed grade x x x x x x x x grade part number package speed grade ordering information
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