PM7347 datasheet(261/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

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

261

Document ID: PMC-1990267, Issue 3

Mode of

Operation

S/UNI-JET Registers (values in Hexadecimal)

300 302

303

304

308

30C 330

334 338

339

340

341

344

34C 360

361

380

39B

T1 PLCP

T1 ADM

--------

--04

External Framer

ADM

Notes

In framer only modes, TGAPCLK and RGAPCLK are enabled by programming Register 301H to 30CH.

Byte, nibble, or bit alignment of the ATM Cell bytes to the line overhead is configured using the TOCTA

bit in Register 300H, and the FORM[1:0] bits in Register 30CH.

Unipolar mode is selected for DS3, E3, and J2 modes by setting the TUNI bit to logic one in Register

302H and the UNI bit in 330H, 338H, and 344H respectively. When the DS3, E3, or J2 framers are

bypassed, unipolar mode is selected by default.

Bit, Nibble, and Byte alignment of the ATM cell octets to the arbitrary external frame overhead is set

using the ALIGN[1:0] bits of Register 361H.

ATM cells are configured to have the Coset Polynomial added to the HCS byte and payload

scrambling/descrambling is enabled.

ATM Idle cell header octets H1, H2, H3, and H4 are configured to be 00H 00H 00H 01H respectively.

13.3

PLCP Frame Formats

The S/UNI-JET supports four different PLCP frame formats:

• DS3 PLCP.

• DS1.

• G.751 E3.

• E1.

The structure of each of these formats is quite similar, and is illustrated in Figure 8 through

Figure 11.

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