PM7347 datasheet(274/341 Pages) PMC

274 / 341 page

S/UNI®-JET Data Sheet

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

274

Document ID: PMC-1990267, Issue 3

Figure 17 16-bit Wide, 27-byte Word Structure

HCS

STATUS/CONTROL

PAYLOAD1

PAYLOAD2

PAYLOAD3

PAYLOAD4

PAYLOAD5

PAYLOAD6

Bit 15

Bit 0

Bit 8

Bit 7

Word 1

Word 2

Word 3

Word 4

Word 5

Word 6

PAYLOAD47

PAYLOAD48

Word 27

The 16-bit SCI-PHY

TM compliant data structure is selected when the ATM8 input is tied low. Bit

15 of each word is the most significant bit, which corresponds to the first bit transmitted or

received. Selection between the 26-byte and 27-byte word structure is done with the DS27_53

when DS27_53 is set to logic zero. The 27-byte word structure is chosen when DS27_53 is set to

logic one. The start of cell indication input and output (TSOC and RSOC) are coincident with

Word 1 (containing the first two header octets). The HCS octet is only passed through the 27-byte

word structure. Word 3 of this structure contains the HCS octet in bits 15 to 8.

In the receive direction with the 27-byte word structure, the lower 8 bits of Word 3 contain the

HCS status octet. An all-zeros pattern in these 8 bits indicates that the associated header is error

free. An all-ones pattern indicates that the header contains an uncorrectable error. (If the

HCSPASS bit in the RXCP-50 Configuration 2 Register is set to logic zero, the all-ones pattern

will never be passed in this structure.) An alternating ones and zeros pattern (xxAA) indicates that

the header contained a correctable error. In this case the header passed through the structure is the

"corrected" header.

In the transmit direction, with the 27-byte word structure, the HCSB bit in the TXCP-50

Configuration 1 Register determines whether the HCS is calculated internally or is inserted

directly from the upper 8 bits of Word 3. The lower 8 bits of Word 3 contain the HCS control

octet. The HCS control octet is an error mask that allows the insertion of one or more errors in the

HCS octet. A logic one in a given bit position causes the inversion of the corresponding HCS bit

position. (For example a logic one in bit 7 causes the most significant bit of the HCS to be

inverted.)

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