
DS21Q55 Quad T1/E1/J1 Transceiver
31 of 237
PIN
E3
M18
M4
A15
A4
R17
M3
C14
B4
T17
N2
NAME
RCLK3
RCLK4
RCLKI1
RCLKI2
RCLKI3
RCLKI4
RCLKO1
RCLKO2
RCLKO3
RCLKO4
RD
(
DS
)
TYPE
O
O
I
I
I
I
O
O
O
O
I
FUNCTION
Receive Clock Output from the Framer, Transceiver #3
Receive Clock Output from the Framer, Transceiver #4
Receive Clock Input for the LIU, Transceiver #1
Receive Clock Input for the LIU, Transceiver #2
Receive Clock Input for the LIU, Transceiver #3
Receive Clock Input for the LIU, Transceiver #4
Receive Clock Output from the LIU, Transceiver #1
Receive Clock Output from the LIU, Transceiver #2
Receive Clock Output from the LIU, Transceiver #3
Receive Clock Output from the LIU, Transceiver #4
Read Input (Data Strobe), Active Low
Receive Frame Sync (before the receive elastic store),
Transceiver #1
Receive Frame Sync (before the receive elastic store),
Transceiver #2
Receive Frame Sync (before the receive elastic store),
Transceiver #3
Receive Frame Sync (before the receive elastic store),
Transceiver #4
Receive Link Clock, Transceiver #1
Receive Link Clock, Transceiver #2
Receive Link Clock, Transceiver #3
Receive Link Clock, Transceiver #4
Receive Link Data, Transceiver #1
Receive Link Data, Transceiver #2
Receive Link Data, Transceiver #3
Receive Link Data, Transceiver #4
Receive Loss of Sync/Loss of Transmit Clock, Transceiver #1
Receive Loss of Sync/Loss of Transmit Clock, Transceiver #2
Receive Loss of Sync/Loss of Transmit Clock, Transceiver #3
Receive Loss of Sync/Loss of Transmit Clock, Transceiver #4
Receive Multiframe Sync, Transceiver #1
Receive Multiframe Sync, Transceiver #2
Receive Multiframe Sync, Transceiver #3
Receive Multiframe Sync, Transceiver #4
Receive Negative Data for the Framer, Transceiver #1
Receive Negative Data for the Framer, Transceiver #2
Receive Negative Data for the Framer, Transceiver #3
Receive Negative Data for the Framer, Transceiver #4
Receive Negative Data from the LIU, Transceiver #1
Receive Negative Data from the LIU, Transceiver #2
Receive Negative Data from the LIU, Transceiver #3
Receive Negative Data from the LIU, Transceiver #4
Receive Positive Data for the Framer, Transceiver #1
Receive Positive Data for the Framer, Transceiver #2
K4
RFSYNC1
O
D17
RFSYNC2
O
A2
RFSYNC3
O
V14
RFSYNC4
O
F1
A12
D3
K18
G2
A13
A3
U12
H2
E17
E1
V11
L1
D16
F2
W16
R3
D13
A1
P17
L3
B15
C2
U17
R4
B14
RLCLK1
RLCLK2
RLCLK3
RLCLK4
RLINK1
RLINK2
RLINK3
RLINK4
RLOS/LOTC1
RLOS/LOTC2
RLOS/LOTC3
RLOS/LOTC4
RMSYNC1
RMSYNC2
RMSYNC3
RMSYNC4
RNEGI1
RNEGI2
RNEGI3
RNEGI4
RNEGO1
RNEGO2
RNEGO3
RNEGO4
RPOSI1
RPOSI2
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
I
I
I
O
O
O
O
I
I