PM7344 datasheet(245/293 Pages) PMC

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PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

229

The S/UNI-MPH is configured for multi-PHY addressing (MPHEN = 1). The

TCAMPH output is updated with the transmit cell available status of the PHY

selected by the TWA[1:0] inputs in the previous cycle. TWA[1:0] is latched while

TWRMPHB is high. On the high to low transition of TWRMPHB, the PHY

selected by the latched address (in this case PHY #1, TWA[1:0] = 0H) begins to

accept its 53 octet cell. During this transfer, the three remaining cell available

signals (from PHY #2, #3, and #4) can be polled as required. The cell available

status of PHY #1 indicates that a cell is available while the cell transfer is in

progress. In the diagram above, at the end of the cell transfer from PHY #1,

PHY #4 (TWA[1:0] = 3H) has a cell available. TWRMPHB is brought high for

one clock cycle to latch the new address. TWRMPHB is then brought low and

the cell transfer to PHY #4 proceeds.

Figure 25

- Multi-PHY Addressing Receive Cell Interface (MPHEN = 1)

• • •

P4 6

P47

P4 8

• • •

RRA[ 1:0]

RFCLK

RCAMPH

RSOC

RXPRTY

RRDMPHB

RDAT[ 7 :0 ]

The S/UNI-MPH is configured for multi-PHY addressing (MPHEN = 1). The

RCAMPH output is updated with the receive cell available status of the PHY

selected by the RRA[1:0] inputs in the previous cycle. RRA[1:0] is latched while

RRDMPHB is high. On the high to low transition of RRDMPHB, the PHY

selected by the latched address (in this case PHY #1, RRA[1:0] = 0H) begins

outputting its 53 octet cell. During this transfer, the three remaining cell available

signals (from PHY #2, #3, and #4) can be polled as required. The cell available

status of PHY #1 indicates that a cell is available while the cell transfer is in

progress. In the diagram above, at the end of the cell transfer from PHY #1,

PHY #4 (RRA[1:0] = 3H) has a cell available. RRDMPHB is brought high for one

clock cycle to latch the new address and to avoid contention on the tristateable

signals. RRDMPHB is then brought low and the cell transfer from PHY #4

proceeds.

PM7344 Datasheet(PDF) 245 Page - PMC-Sierra, Inc

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