參數(shù)資料
型號(hào)： MPC823UM_REV1_16-CPM7
廠商： Motorola, Inc.
英文描述： 10 AMP SUBMINIATURE POWER RELAY
中文描述： 通信處理器模塊
文件頁(yè)數(shù)： 57/74頁(yè)
文件大?。?/td> 234K
代理商： MPC823UM_REV1_16-CPM7
Communication Processor Module
MOTOROLA
MPC823 REFERENCE MANUAL
16-435
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C
1
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16.12.3.2 SPI PARAMETER RAM MEMORY MAP.
The SPI parameter RAM area begins
at the SPI base address and is used for the general SPI parameters. Notice that it is similar
to the SCCx general-purpose parameter RAM. You must initialize certain parameter RAM
values before the serial peripheral interface is enabled. The communication processor
module initilizes the other values. Once initialized, the parameter RAM values do not usually
need to be accessed by your software. They only need to be modified when there is no serial
peripheral interface activity in progress.
RBASE and TBASE—The dual-port RAM starts receiving and transmitting data for the
RX and TX buffer descriptors in the RBASE and TBASE entries. They provide a great
deal of flexibility for partitioning buffer descriptors for a serial peripheral interface. You
must initialize these entries before enabling the corresponding channel. You must not
configure the SPI buffer descriptor tables to overlap with the tables of the USB, SMCx,
and SCCx or erratic operation will occur. RBASE and TBASE must contain a value that
is divisible by eight.
Table 16-39. SPI Parameter RAM Memory Map
ADDRESS
NAME
WIDTH
DESCRIPTION
SPI Base + 00
RBASE
Half-word
RX Buffer Descriptor Base Address
SPI Base+ 02
TBASE
Half-word
TX Buffer Descriptor Base Address
SPI Base+ 04
RFCR
Byte
RX Function Code
SPI Base+ 05
TFCR
Byte
TX Function Code
SPI Base+ 06
MRBLR
Half-word
Maximum Receive Buffer Length
SPI Base+ 08
RSTATE
Word
RX Internal State
SPI Base+ 0C
RPTR
Word
RX Internal Data Pointer
SPI Base + 10
RBPTR
Half-word
RX Buffer Descriptor Pointer
SPI Base + 12
RCNT
Half-word
RX Internal Byte Count
SPI Base + 14
RTMP
Word
RX Temp
SPI Base + 18
TSTATE
Word
TX Internal State
SPI Base + 1C
TPTR
Word
TX Internal Data Pointer
SPI Base + 20
TBPTR
Half-word
TX Buffer Descriptor Pointer
SPI Base + 22
TCNT
Half-word
TX Internal Byte Count
SPI Base + 24
TTMP
Word
TX Temp
NOTE:
You are only responsible for initializing the items in bold.
SPI Base = (IMMR & 0xFFFF0000) + 0x3D80.
SCCx Ethernet parameter RAM space overlaps the SPI parameter RAM space. The address range
for SCCx space is 0x1000 through 0x1CA3. You need a microcode patch to run SPI and Ethernet
concurrently.
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