Revision J – April 7, 2006
S2004 – Quad Serial Backplane Device
Data Sheet
In order to provide interface compatibility to non-
AMCC serial backplane transceivers, the S2004 can
also generate a unique sync character consisting of 16
consecutive K28.5 characters. This event is initiated
by the simultaneous assertion of SYNC and DN. The
SYNC character may start with either a positive or
negative parity K28.5. (Depending on the current run-
ning disparity.) The parity of the second and third
K28.5 are inverse with respect to a valid 8B/10B
sequence. Parity of the remaining K28.5 are 8B/10B
compliant. Thus the parity of the K28.5 pattern con-
sists of + + - - + - + - + - + - + - + - or - - + + -+ - + - + -
+ - + - +.
nel. The SYNC input is common to all four channels.
Table 2 identifies the S2004 transmit control signals.
The special SYNC generation commences on the first
cycle in which SYNC and DN=1 and continues for 16
cycles. During this period, the SYNC, KGEN, and DN
inputs are ignored (assertion of DN and SYNC during
this period will not prolong or re-initialize the special
sync character generation).
Frequency Synthesizer (PLL)
The S2004 synthesizes a serial transmit clock from the
reference signal. Upon startup, the S2004 will obtain
phase and frequency lock within 2500 bit times after
the start of receiving reference clock inputs. Reliable
locking of the transmit PLL is assured, but a lock-
detect output is NOT provided.
When operating in the channel locked mode, the
KGENx and DNx inputs must be driven for each chan-
Table 2. Transmitter Control Signals
SYNC
KGENx
DNx
S2004 Output
0
0
0
0
0
1
0
1
1
Encoded Parallel Data.
K28.5 Character.
K Character as defined by Table 3 and DIN[7:0].
1
X
1
Special 16 word SYNC character generated and resets the transmit FIFO.
Table 3. K Character Generation (DNx = 1 KGENx =1 SYNC = 0)
Current RD+
abcdei fghj
Current RD-
K
Character
DIN[7:0]
KGEN
abcdei fghj
Comments
Sync Character
K28.0
K28.1
K28.2
K28.3
K28.4
K28.5
K28.6
K28.7
K23.7
K27.7
K29.7
K30.7
000 11100
001 11100
010 11100
011 11100
100 11100
101 11100
110 11100
111 11100
111 10111
111 11011
111 11101
111 11110
1
1
1
1
1
1
1
1
1
1
1
1
110000 1011
110000 0110
110000 1010
110000 1100
110000 1101
110000 0101
110000 1001
110000 0111
000101 0111
001001 0111
010001 0111
100001 0111
001111 0100
001111 1001
001111 0101
001111 0011
001111 0010
001111 1010
001111 0110
001111 1000
111010 1000
110110 1000
101110 1000
011110 1000
AMCC Confidential and Proprietary
11
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
