參數(shù)資料
型號: UPD70216HLP-16
廠商: NEC Corp.
英文描述: CONNECTOR ACCESSORY
中文描述: 連接器附件
文件頁數(shù): 33/110頁
文件大?。?/td> 625K
代理商: UPD70216HLP-16
33
μ
PD70208H, 70216H
Data Sheet U13225EJ4V0DS00
12. DMAU (DMA CONTROL UNIT)
The DMAU has 4 DMA channels, and provides the functions (subset) of two LSIs, the
μ
PD71071 and
μ
PD71037.
12.1 FEATURES
Two operating modes (
μ
PD71071 mode,
μ
PD71037 mode)
20-bit address register
16-bit count register
Four independent DMA channels
Byte transfer/word transfer selectable
Three transfer modes (settable on an individual channel basis)
Single transfer mode, demand transfer mode, block transfer mode
Two bus modes (common to all channels: in
μ
PD71037 mode, bus release mode only)
Bus release mode
Bus hold mode
DMA requests maskable on an individual channel basis
Auto initialization function
Transfer address increment/decrement
Two channel priority systems (fixed priority/rotating priority)
TC output at end of transfer
Forced termination of service by END input
Cascading capability
12.2 DMAU INTERNAL BLOCK DIAGRAM
Notes 1.
In
μ
PD71071 mode
2.
In
μ
PD71037 mode
(20)
(8)
Internal Address Bus
Internal Data Bus
Internal Control Bus
BUSRQ
BUSAK
BAU
DMARQ0-
DMARQ3
DMAAK0-
DMAAK3
External
pins
END/TC
Internal Bus
Interface
Priority Control
DMAU Address Bus (20)
Address Increment/
Decrement
(20)
Address
Registers
Current Address (20
×
4)
Base Address (20
×
4)
DMAU Data Bus
Count
Registers
Base Count (16
×
4)
Current Count (16
×
4)
Terminal Count
Count Decrementer
(16)
Control Register Group
Channel
Note 1
(4)
Device Control
(10)
Status
(8)
Mode Control
(7
×
4)
Mask
(4)
Request
(4)
Note 2
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