Revision J – April 7, 2006
S2004 – Quad Serial Backplane Device
Data Sheet
Table 13. Mode Control Signals (Continued)
Pin Name
Level
I/O
Pin #
Description
RATE
TTL
I
D12
When Low, the S2004 operates with the serial output rate equal to the VCO fre-
quency. When High, the S2004 operates with the VCO internally divided by 2 for all
functions.
Note: All TTL inputs except REFCLK have internal pull-up networks.
Table 14. Receiver Output Pin Assignment and Descriptions
Pin Name
Level
I/O
Pin #
Description
DOUTA7
DOUTA6
DOUTA5
DOUTA4
DOUTA3
DOUTA2
DOUTA1
DOUTA0
TTL
O
J1
J3
J2
H1
H2
H3
F1
G2
Channel A Receiver Data Outputs. Parallel data on this bus is valid on the rising
edge of RCAP in full clock mode and valid on rising edge of both RCAP and
RCAN in half clock mode.
EOFA
TTL
TTL
O
O
F2
Channel A End of Frame Detected. A High on this output indicates that a valid
K28.5 has been detected and is present on the parallel data outputs DOUTA[0:7].
KFLAGA
G3
Channel A K-Character Flag. A High in KFLAGA indicates that a valid control
character has been detected. Data present on the parallel interface DOUTA[0:7]
should be used to indicate which character was received.
ERRA
TTL
TTL
O
O
G1
Channel A Receive Error. A High on ERRA signifies the occurrence of either a
parity error or an invalid codeword error during decoding of the received data.
RCAP
RCAN
K2
K1
Receive Data Clock. Parallel receive data, DOUTA[0:7], EOFA, KFLAGA, and
ERRA are valid on the rising edge of RCAP when in full clock mode and valid on
the rising edge of both RCAP and RCAN in half clock mode.
DOUTB7
DOUTB6
DOUTB5
DOUTB4
DOUTB3
DOUTB2
DOUTB1
DOUTB0
TTL
O
R1
P1
M3
N2
M2
N1
L2
Channel B Receiver Data Outputs. Parallel data on this bus is valid on the rising
edge of RCBP in full clock mode and valid on rising edge of both RCBP and
RCBN in half clock mode.
M1
EOFB
TTL
TTL
O
O
L1
Channel B End of Frame Detected. A High on this output indicates that a valid
K28.5 has been detected and is present on the parallel data outputs DOUTB[0:7].
KFLAGB
P2
Channel B K-Character Flag. A High in KFLAGB indicates that a valid control
character has been detected. Data present on the parallel interface DOUTB[0:7]
should be used to indicate which character was received.
ERRB
TTL
TTL
O
O
K3
Channel B Receive Error. A High on ERRB signifies the occurrence of either a
parity error or an invalid codeword error during decoding of the received data.
RCBP
RCBN
U1
T1
Receive Data Clock. Parallel receive data, DOUTB[0:7], EOFB, KFLAGB, and
ERRB are valid on the rising edge of RCBP when in full clock mode and valid on
the rising edge of both RCBP and RCBN in half clock mode.
26
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