S/UNI®-ATLAS-3200 Telecom Standard Product Data Sheet
Preliminary
Pin Name
ICIF_ENB_STPA
Type
Output
Pin No Function
(A) RLU_RDENB
(A) Read enable. Active low signal asserted to initiate a cell
transfer. Used for address selection during the last cycle before it
is asserted.
(B) not used
(C) RLP_ENB
(C) Read enable. The RLP_ENB signal is used to control the flow
of data from the PHY’s receive FIFOs. During data transfer,
RLP_VAL will be monitored as it will indicate if the
RLP_DAT[31:0], RLP_PAR, RLP_MOD[1:0], RLP_SOP,
RLP_EOP, RLP_ERR and RLP_SX are valid. RLP_ENB will be
deasserted anytime the S/UNI-ATLAS-3200 is unable to accept
data from the PHY device.
When RLP_ENB is sampled high by the PHY device, a read
should not be performed and the RLP_DAT[31:0], RLP_PAR,
RLP_MOD[1:0], RLP_SOP, RLP_EOP, RLP_ERR, RLP_SX and
RLP_VAL signals must remain unchanged on the following rising
edge of RLP_CLK.
(D) TPP_STPA
(D) Selected PHY packet available. TPP_STPA is high whenever
there are at least 16 32-bit words available in the transmit FIFO
for the currently selected PHY. When TPP_STPA transitions low,
it indicates that there are less than 16 32-bit words available in
the Transmit FIFO. The latency on this signal is no more than 8
cycles. If STPA is being used, the source must take this latency
into account in using STPA to avoid overflow. The use of STPA
is optional; the source may safely rely solely on PTPA.
The port whose status TPP_STPA reports is updated on the
following rising edge of TPP_CLK after the PHY address on
TPP_DAT is sampled by the PHY device.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990553, Issue 4
51
PMC [ PMC-SIERRA, INC ]
