PM7347 datasheet(318/341 Pages) PMC

318 / 341 page

S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

318

Document ID: PMC-1990267, Issue 3

Figure 74 Multi-PHY Polling and Addressing Receive Cell Interface

RCA

RSOC

RDAT[15:0]

RPRTY

W(n-7) W(n-6) W(n-5)

W(n-4) W(n-3) W(n-2) W(n-1) W(n)

RFCLK

RENB

RADR[2:0]

CA(A)

CA(B)

CA(C)

CA(B)

1Fh

CA(D)

1Fh

DRCA[D]

RCALEVEL0=0

Figure 74 shows an example of the multi-PHY polling and selection sequence supported by the

S/UNI-JET . "A", "B", "C", "D", and "E" represent any arbitrary address values which may be

occupied by the S/UNI-JET . Initially cell data is being received from PHY “D,” and the

DRCA[D] signal shows how the DRCA[x] signals behave based on the value of the

RCALEVEL0 register bit(s). The ATM Layer device is not restricted in its polling order. The

PHY associated with address "A" indicates it does not have a cell available, but PHY "B"

indicates that it does. As a result, the ATM Layer places address "B" on RADR[2:0] the cycle

before RENB is asserted to select PHY "B" as the next cell source. In this example, PHY "C"s

status is ignored. The ATM Layer device is not constrained to select the latest PHY polled. As

soon as the cell transfer is started, the polling process may be restarted. The data on RDAT (W1,

W2, ..) may be 8-bit or 16-bits wide, depending on the setting of the ATM8 input.

During multi-PHY operation, several PHY layer devices share the RDAT[15:0], RSOC, RPRTY,

and RCA signals. As a result, these signals must be tri-stated in all PHY devices which have not

been selected for reading or polling by the ATM Layer. Selection of which PHY layer device is

being read is made by the value on RADR[2:0] the cycle before RENB is asserted and affects the

RDAT[15:0], RSOC, and RPRTY signals. The value of RADR[2:0] selects the PHY being polled

for the RCA signal, and all devices not corresponding to this address must tri-state its RCA

output. These multi-PHY operations are directly supported by the S/UNI-JET.

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