MPC8280 datasheet(999/1386 Pages) FREESCALE

999 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-39

31.10.1.1 Determining UEAD_OFFSET (UEAD Mode Only)

The UEAD_OFFSET value is based on the position of the user-defined extended address (UEAD) in the

UDC extra header. Table 31-12 shows how to determine UEAD_OFFSET: first determine the

halfword-aligned location of the UEAD, and then read the corresponding UEAD_OFFSET value.

31.10.1.2 VCI Filtering (VCIF)

VCI filtering enable bits are shown in Figure 31-22.

Table 31-13 describes the operation of the VCI filtering enable bits.

0xB0

TCR

Hword (ABR only) Tag cell rate. The minimum cell rate allowed for all ABR

channels. An ABR channel whose ACR is less than TCR sends only

out-of-rate F-RM cells at TCR. Should be set to 10 cells/sec as defined in

the TM 4.0. Uses the ATMF TM 4.0 floating-point format. Note that the

APC minimum cell rate (MCR) should be at least TCR.

0xB2

ABR_RX_TCTE

Hword (ABR only) Points to total of 16 bytes reserved dual-port RAM area used

by the CP. Should be 16-byte aligned. User-defined offset from dual-port

RAM base.

—

Additional parameters

—

• For additional AAL1 CES parameters, refer to Table 32-4.

• For additional AAL2 parameters, refer to Table 33-13.

Offset from FCC base: 0x8400 (FCC1) and 0x8500 (FCC2); see Section 14.5.2, “Parameter RAM.”

Offset

015

0x0

UEAD_OFFSET = 0x2

UEAD_OFFSET = 0x0

0x4

UEAD_OFFSET = 0x6

UEAD_OFFSET = 0x4

0x8

UEAD_OFFSET = 0xA

UEAD_OFFSET = 0x8

Table 31-12. UEAD_OFFSETs for Extended Addresses in the UDC Extra Header

012

56789

Field

VC3

VC4

VC6 VC7 VC8 VC9 VC10 VC11 VC12 VC13 VC14 VC15

Figure 31-22. VCI Filtering Enable Bits

Table 31-13. VCI Filtering Enable Field Descriptions

Bits

Name

Description

0–2, 5

—

Clear these bits.

3, 4, 6,

7–15

VCI filtering enable

0 Do not send cells with this VCI to the raw cell queue.

1 Send cells with this VCI to the raw cell queue.

Table 31-11. ATM Parameter RAM Map (continued)

Offset1

Name

Width

Description

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