MPC8280 datasheet(603/1386 Pages) FREESCALE

603 / 1386 page

Serial Interface with Time-Slot Assigner

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

15-25

Table 15-7 describes SIxCMDR fields.

15.5.5

SI Status Registers (SI

xSTR)

The SI status register (SIxSTR), shown in Figure 15-20, identifies the current-route RAM. SIxSTR values

are valid only when the corresponding SIxCMDR bit = 0.

Table 15-8 describes SIxSTR fields.

15.6

Serial Interface IDL Interface Support

The IDL interface is a full-duplex ISDN interface used to connect a physical layer device to the MPC8280.

The MPC8280 supports both the basic and primary rate of the IDL bus. In the basic rate of IDL, data on

three channels (B1, B2, and D) is transferred in a 20-bit frame, providing a full-duplex bandwidth of 160

Table 15-7. SI

xCMDR Field Description

Bits

Name

Description

0, 2, 4, 6 CSRRx Change shadow RAM for TDM a, b, c, or d receiver. Set CSRRx causes the SI receiver to replace

the current route RAM with the shadow RAM. Set by the user and cleared by the SI.

0 The receiver shadow RAM is not valid. The user can write into the shadow RAM to program a

new routing.

1 The receiver shadow RAM is valid. The SI exchanges between the RAMs and take the new

receive routing from the receiver shadow RAM. Cleared as soon as the switch has completed.

1, 3, 5, 7 CSRTx Change shadow RAM for TDM a, b, c, or d transmitter. Set CSRTx causes the SI transmitter to

replace the current route RAM with the shadow RAM. Set by the user and cleared by the SI.

0 The transmitter shadow RAM is not valid. The user can write into the shadow RAM to program a

new routing.

1 The transmitter shadow RAM is valid. The SI exchanges between the RAMs and take the new

transmitter routing from the receiver shadow RAM. Cleared as soon as the switch has completed.

01234567

Field

CRORA

CROTA

CRORB

CROTB

CRORC

CROTC

CRORD

CROTD

Reset

0000_0000

R/W

Addr

11B2C (SI1STR), 11B4C (SI2STR)

Figure 15-20. SI Status Registers (SI

xSTR)

Table 15-8. SI

xSTR Field Descriptions

Bits

Name

Description

0, 2, 4, 6

CRORx

Current-route original receiver. Determines whether the current-route receiver RAM is the original

or the shadow.

0 The current-route receiver RAM is the lower address area.

1 The current-route receiver RAM is the upper address area.

1, 3, 5, 7

CROTx

Current-route original transmitter. Determines whether the current-route transmitter RAM is the

original or the shadow.

0 The current-route transmitter RAM is the lower address area.

1 The current-route transmitter RAM is the upper address area.

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