MPC8280 datasheet(1296/1386 Pages) FREESCALE

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Serial Peripheral Interface (SPI)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

39-12

Freescale Semiconductor

39.5.1

Receive/Transmit Function Code Registers (RFCR/TFCR)

Figure 39-9 shows the fields in the receive/transmit function code registers (RFCR/TFCR).

Table 39-6 describes the RFCR/TFCR fields.

39.6

SPI Commands

Table 39-7 lists transmit/receive commands sent to the CP command register (CPCR).

01234567

Field

—

GBL

TC2

DTB

—

Reset

0000_0000

R/W

Addr

SPI Base + 04 (RFCR)/SPI Base + 05 (TFCR)

Figure 39-9. RFCR/TFCR—Function Code Registers

Table 39-6. RFCR/TFCR Field Descriptions

Bits

Name

Description

0–1

—

Reserved, should be cleared.

GBL

Global access bit

0 Disable memory snooping

1 Enable memory snooping

3–4

Byte ordering. Set BO to select the required byte ordering for the buffer. If BO is changed on-the-fly,

it takes effect at the beginning of the next frame or BD.

00 True little-endian. Note this mode can only be used with 32-bit port size memory.

01 Munged little-endian

1x Big-endian

TC2

Transfer code 2. Contains the transfer code value of TC[2], used during this SDMA channel memory

access. TC[0–1] is driven with a 0b11 to identify this SDMA channel access as a DMA-type access.

DTB

Data bus indicator.

0 Use 60x bus for SDMA operation.

1 Use local bus for SDMA operation.

—

Reserved, should be cleared.

Table 39-7. SPI Commands

Command

Description

INIT TX

PARAMETERS

Initializes all transmit parameters in the parameter RAM to their reset state and should be issued only when

the transmitter is disabled. The INIT TX AND RX PARAMETERS command can also be used to reset both the Tx

and Rx parameters.

CLOSE RXBD

Forces the SPI controller to close the current RxBD and use the next BD for subsequently received data. If the

controller is not receiving data, no action is taken. Use this command to extract data from a partially full buffer.

INIT RX

PARAMETERS

Initializes all receive parameters in the parameter RAM to their reset state. Should be issued only when the

receiver is disabled. The INIT TX AND RX PARAMETERS command can also be used to reset both the Tx and Rx

parameters.

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