DS3161 datasheet(79/384 Pages) MAXIM

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DS3161/DS3162/DS3163/DS3164

Figure 8-33 shows a multi-port receive interface multiple cell transfer from different PHY ports. On clock edge 1,

the ATM device polls PHY port 'N'. On clock edge 3, PHY port 'N' indicates to the ATM device that it has a

complete cell ready for transfer by asserting RPXA. On clock edge 5, the ATM device selects PHY port 'N'. On

clock edge 6, the ATM device indicates to PHY port 'N' that it is ready to accept a complete cell transfer by

asserting

REN. On clock edge 8, PHY port 'N' starts a cell transfer by placing the first byte of cell data on RDATA,

and asserting RSOX to indicate the transfer of the first byte of the cell. On clock edge 9, PHY port 'N' de-asserts

RSOX as it continues to place additional bytes of the cell on RDAT. On clock edge 11, the ATM device polls PHY

device 'N'. On clock edge 12, PHY port 'M' indicates to the ATM device that it has a complete cell ready for transfer

by asserting RPXA. On clock edge 12, PHY port 'N' indicates to the ATM device that it does not have a complete

cell ready for transfer by de-asserting RPXA. On clock edge 15, the ATM device deselects PHY port 'N' and selects

PHY port 'M' by de-asserting

REN and placing PHY port 'M's address on RADR. On clock edge 16, the ATM device

asserts

REN. On clock edge 17, PHY port 'N' stops transferring cell data. On clock edge 18, PHY port 'M' starts a

cell transfer by placing the first byte of cell data on RDATA, and asserting RSOX to indicate the transfer of the first

byte of the cell. On clock edge 19, PHY port 'M' de-asserts RSOX as it continues to place additional bytes of the

cell on RDATA.

Figure 8-33. UTOPIA Level 3 Receive Multiple Cell Transfer Polled Mode

RADR

RPXA

REN

RDAT

RSOX

RCLK

Transfer

Cell From:

…

H2 …

…

LNP

P44

P45

P46

P47

P48

P43

DS3161 Datasheet(PDF) 79 Page - Maxim Integrated Products