PM7324 Ver la hoja de datos (PDF) - PMC-Sierra
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PM7324 Datasheet PDF : 473 Pages
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S/UNI-ATLAS
DATASHEET
PMC-1971154
Pin Name
RCA[1]
RCA[2]
RCA[3]
RCA[4]
Type
I/O
RCA[4:1]
(continued)
ISSUE 7
PM7324 S/UNI-ATLAS
S/UNI-ATM LAYER SOLUTION
Pin Function
No.
U2 The active polarity of these signals is programmable and defaults
T1
to active high.
R3
If the RPOLL pin is low, the ATLAS asserts the appropriate
RRDENB[4:1] signal in response to a round robin polling of the
R4 RCA[4:1] signals. Once committed, the ATLAS will transfer an
entire cell from a single PHY before servicing the next. The
ATLAS will complete the read of an entire cell even if the
associated RCA[4:1] input is deasserted during the cell transfer.
Sampling of the RCA[4:1] inputs resumes the cycle after the last
octet of a cell has been transferred.
Note, RCA[1] is an input only.
If the RPOLL pin is high, the RCA[3:2] pins are redefined as
RADDR[4:3] and the RCA[4] pin is redefined as RAVALID.
If the RPOLL pin is high, the ATLAS polls up to 32 PHYs using
the PHY address signals RADDR[4:0]. A PHY device being
addressed by RADDR[4:0] is expected to indicate whether or not
it has a complete cell available for transfer by driving RCA[1]
during the clock cycle following that in which it is addressed.
When a cell transfer is in progress, the ATLAS will not poll the
PHY device which is sending the cell and so PHY devices need
not support the cell availability indication during cell transfer. The
selection of a particular PHY device from which to transfer a cell
is indicated by the state of RADDR[4:0] and when RRDENB[1] is
asserted.
Note, RCA[1] is an input only. The RCA[4:1] signals are sampled
on the rising edge of RFCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC AND FOR ITS CUSTOMERS’ INTERNAL USE 12
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