PM7340 datasheet(60/334 Pages) PMC

60 / 334 page

PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7340 S/UNI-IMA-8

DATA SHEET

PMC-2001723

ISSUE 3

INVERSE MULTIPLEXING OVER ATM

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

UTOPIA L2 Mode the virtual PHY port must first be selected prior to the start of

the data transfer. This selection is done using the same address lines that are

used for polling in combination with the TENB pin.

Data transfers are cell based, that is, an entire cell is transferred from one PHY

device before another is selected. Polling occurs concurrently with cell transfers

to ensure maximum throughput. Data pausing is not supported in Any-PHY

mode. If the TENB is deasserted prior to a complete cell being transferred, the

cell transfer error will be triggered.

The Transmit Cell Transfer Format is shown in Figure 5 and Figure 6. Word/byte

0 is required for cell transfers to an Any-PHY slave. The address prepend is the

S/UNI-IMA-8 virtual PHY ID. The virtual PHY ID can be mapped to a TC link or to

an IMA group. Optional prepends are supported, but are ignored by the S/UNI-

IMA-8.

Inclusion of optional words is statically configurable for the interface. The optional

words are always ignored.

Figure 5

- 16-bit Transmit Cell Transfer Format

Bits 15-8

Bits 7-0

Word 0

(Any-PHY

only)

Address Prepend

Word 1

(Optional)

Optional Prepend

Word 2

Word 3

Word 4

HEC/UDF

Word 5

PAYLOAD1

PAYLOAD2

Word 6

PAYLOAD3

PAYLOAD4

••

••••••••

Word 28

PAYLOAD47

PAYLOAD48

PM7340 Datasheet(PDF) 60 Page - PMC-Sierra, Inc

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