MPC8280 datasheet(1046/1386 Pages) FREESCALE

1046 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

31-86

Freescale Semiconductor

Table 31-47 describes FPSMR fields.

Field

TEHS

REHS

ICD

TUMS RUMS

LAST PHY/PHY ID

Reset

0000_0000_0000_0000

R/W

Addr

0x11304 (FPSMR1), 0x11324 (FPSMR2), 0x11344(FPSMR3)

16 17

Field

—

TPRI TUDC RUDC RXP

TUMP

—

TSIZE RSIZE UPRM UPLM RUMP HECI HECC COS

Reset

0000_0000_0000_0000

R/W

Addr

0x11306 (FPSMR1), 0x11326 (FPSMR2), 0x11346 (FPSMR3)

Figure 31-59. FCC ATM Mode Register (FPSMR)

Table 31-47. FCC ATM Mode Register (FPSMR)

Bits

Name

Description

0–3

TEHS

Transmit extra header size. Used only in user-defined cell mode to hold the Tx user-defined

cells’ extra header size. Values between 0–11 are valid. TEHS = 0 generates 1 byte of extra

header; TEHS = 11 generates 12 bytes of extra header.

Note: When working with a 16-bit UTOPIA interface, TEHS must represent an even number of

header bytes (so the actual programmed value should be odd).

Note: For IMA1 there is no extra header support for User defined cells so these bits should be

programmed to zero for IMA support.

4–7

REHS

Receive extra header size. Used only in user-defined cell mode to hold the Rx user-defined

cells’ extra header size. Values between 0–11 are valid. For REHS = 0, the receiver expects 1

byte of extra header; for REHS = 11, it expects 12 bytes of extra header.

Note: When working with a 16-bit UTOPIA interface, REHS must represent an even number of

header bytes (so the actual programmed value should be odd).

Note: For IMA1 there is no extra header support for User defined cells so these bits should be

programmed to zero for IMA support.

ICD

Idle cells discard

0 Discard idle cells (GFC, VPI, VCI, PTI =0)

1 Do not discard idle cells

Note: For IMA1 It is recommended to program ICD=1 so that idle cells will not be discarded.

Idle cells should not occur on an IMA link, and their presence indicates an IMA protocol

violation. Software should disable the discarding of idle cells, route the idle cells to a

dedicated channel, and treat reception of cells on that dedicated channel as an indication

of a system or system configuration error

TUMS

Transmit UTOPIA master/slave mode

0 Transmit UTOPIA master mode is selected (Use this mode for IMA support1)

1 Transmit UTOPIA slave mode is selected

RUMS

Receive UTOPIA master/slave mode

0 Receive UTOPIA master mode is selected (Use this mode for IMA support1)

1 Receive UTOPIA slave mode is selected

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