MPC8280 datasheet(908/1386 Pages) FREESCALE

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Multi-Channel Controllers (MCCs)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

29-18

Freescale Semiconductor

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Automatic retransmission of signal units (for link-status signal unit (LSSU) retransmission)

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Automatic discard of identical FISUs and LSSUs using a user-defined mask

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Octet counting mode in case of long signal units and receiver overrun

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Five circular interrupt tables with programmable size and overflow identification—one for

transmit and four for receive.

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Global or individual channel loop modes

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Efficient bus usage (no bus usage for inactive channels or for active channels with nothing to send)

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Efficient control of interrupts to the CPU

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Supports external BD tables

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Uses on-chip dual-port RAM for parameter storage

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Uses 64-bit data transactions for reading and writing data in BDs

Table 29-10 describes channel-specific parameters for SS7. Note that a given parameter location may have

a different definition depending on the standard used (ITU-T/ANSI or Japanese standard).

Table 29-10. Channel-Specific Parameters for SS7

Offset1

Name2

Width

Description

0x00

TSTATE

Word

Tx internal state. The user must write to TSTATE 0xHH80_0000. HH is the TSTATE High

Byte. Refer to Section 29.3.1.1, “Internal Transmitter State (TSTATE)—HDLC Mode.”

0x04

ZISTATE

Word

Zero-insertion machine state. User-initialized to one of the following values:

0x10000207 for regular channel transmitting all 1s before first frame of data

0x00000207 for regular channel transmitting flags before first frame of data

0x30000207 for inverted channel transmitting all 1s before first frame of data

0x20000207 for inverted channel transmitting flags before first frame of data

Note: Used in conjunction with ZIDATA0 and ZIDATA1.

0x08

ZIDATA0

Word

Zero-insertion high word data buffer. User-initialized to one of the following values:

0xFFFFFFFF allows transmission of all 1s before first frame of data

0x7E7E7E7E allows transmission of flags before first frame of data

Note: Used in conjunction with ZISTATE and ZIDATA1.

0x0C

ZIDATA1

Word

Zero-insertion low word data buffer. User-initialized to one of the following values:

0xFFFFFFFF allows transmission of all 1s before first frame of data

0x7E7E7E7E allows transmission of flags before first frame of data

Note: Used in conjunction with ZISTATE and ZIDATA0.

0x10

TBDFlags

Hword

TxBD flags, used by the CP (read-only for the user)

0x12

TBDCNT

Hword

Tx internal byte count. Number of remaining bytes in buffer, used by the CP (read-only

for the user)

0x14

TBDPTR

Word

Tx internal data pointer. Points to current absolute data address of channel, used by the

CP (read-only for the user)

0x18

ECHAMR

Word

Extended channel mode register. See 29.3.4.1, “Extended Channel Mode Register

(ECHAMR)—SS7 Mode.”

0x1C

TCRC

Word

Temporary transmit CRC. Temporary value of CRC calculation result, used by the CP

(read-only for the user)

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