参数资料
型号: IBM25403GCX-3JC76C2
元件分类: 微控制器/微处理器
英文描述: RISC PROCESSOR, PQFP16
封装: PLASTIC, QFP-160
文件页数: 42/54页
文件大小: 541K
代理商: IBM25403GCX-3JC76C2
IBM PowerPC 403GCX
47
DMA Buffered Single Transfer from Peripheral to 3-Cycle DRAM
Bank Register Bit Settings
DMA Control Register Bit Settings
Notes:
1. DMAR must be inactive inactive at the start of cycle 9 to guarantee a single transfer.
2. This waveform assumes that the internal address mux is used.
3. CAS0 is used for byte accesses, CAS0:1 for halfwords, and CAS0:3 for fullwords.
SLF
ERM
Bus
Width
Ext
Mux
RAS-to-
CAS
Refresh
Mode
Page
Mode
First
Access
Burst
Access
Prechg
Cycles
Refresh
RAS
Refresh
Rate
Bit 13 Bit 14 Bits 15:16 Bit 17
Bit 18
Bit 19
Bit 20 Bits 21:22 Bits 23:24
Bit 25
Bit 26
Bits 27:30
0 or 1
0
10
0
01
xx
0
x
xxxx
Transfer Direction Transfer Width Transfer Mode PeripheralSetup Peripheral Wait Peripheral Hold
Bit 2
Bits 4:5
Bits 9:10
Bits 11:12
Bits 13:18
Bits 19-21
1
10
00
00 0000
000
DMAR
DMAA
A11:29
R/W
RAS
CAS0:3
DRAMOE
DRAMWE
D0:31
OE
WBE0:3
1
2
3
4
5
6
7
8
9
10
11
12
SysClk
Sync
BIU
Req
DMA
Ack
RAS
CAS
Pre-Chg
Row
Column
Data
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