參數(shù)資料
型號: IBM25403GCX-3JC76C2
元件分類: 微控制器/微處理器
英文描述: RISC PROCESSOR, PQFP16
封裝: PLASTIC, QFP-160
文件頁數(shù): 44/54頁
文件大?。?/td> 541K
代理商: IBM25403GCX-3JC76C2
IBM PowerPC 403GCX
49
DMA Fly-By Continuous Burst to 3-Cycle DRAM
Bank Register Bit Settings
DMA Control Register Bit Settings
Notes:
1. DMAR must be inactive at the end of cycle 10 (last DMAA cycle) to guarantee three transfers.
2. Peripheral data bus width must match DRAM bus width.
3. See diagram for settings.
4. This waveform assumes that the internal address mux is used.
5. CAS0 is used for byte accesses, CAS0:1 for halfwords, and CAS0:3 for fullwords.
6. Numbers (1,2,3,...) in the DMAR signal represent when DMAR is sampled and accepted. Numbers (1,2,3,...) in the
DMAA signal represent the transfers associated with the accepted DMAR.
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
1
01
0
x
xxxx
Transfer
Direction
Transfer
Width
Transfer
Mode
Peripheral
Setup
Peripheral
Wait
Peripheral
Hold
Burst Mode
Bit 2
Bits 4:5
Bits 9:10
Bits 11:12
Bits 13:18
Bits 19-21
Bit 25
1
10
01
Note 3
xx xxxx
xxx
1
SysClk
DMAR
DMAA
A11:29
R/W
RAS
CAS0:3
DRAMOE
DRAMWE
D0:31
2
3
4
5
6
7
8
9
10
11
12
S=0
S=1
(S = peripheral setup time)
DMADXFER
Sync
BIU
Req
RAS
CAS
Pre-Chg
Row
Column1
Column2
Column3
Data1
Data2
Data3
1
2
3
1
2
3
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