參數(shù)資料
型號: ISP1581BD
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: Universal Serial Bus 2.0 high-speed interface device
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件頁數(shù): 26/73頁
文件大?。?/td> 1819K
代理商: ISP1581BD
Philips Semiconductors
ISP1581
USB 2.0 HS interface device
Objective specification
Rev. 02 — 23 October 2000
26 of 73
9397 750 07648
Philips Electronics N.V. 2000. All rights reserved.
9.4.1
DMA Command register (address: 30H)
The DMA Command register is a 1-byte register that initiates all DMA transfer activity
on the DMA Controller. The register is write-only: reading it will return FFH.
Table 30: DMA Command register: bit allocation
Bit
7
Symbol
Reset
Bus reset
Access
6
5
4
DMA_CMD[7:0]
FFH
FFH
W
3
2
1
0
Table 31: DMA Command Register: bit description
Bit
Symbol
7:0
DMA_CMD[7:0]
Description
DMA command code, see
Table 32
.
Table 32: DMA commands
Code (Hex)
00
Name
GDMA Read
Description
Generic DMA IN token transfer (slave mode only):
Data is transferred from the external DMA bus to the
internal buffer. Strobe: DIOW by external DMA
Controller.
Generic DMA OUT token transfer (slave mode
only):
Data is transferred from the internal buffer to the
external DMA bus. Strobe: DIOR by external DMA
Controller.
UDMA Read command:
Data is transferred from the
external DMA to the internal DMA bus.
UDMA Write command:
Data is transferred in UDMA
mode from the internal buffer to the external DMA bus.
PIO Read command for ATAPI device:
Data is
transferred in PIO mode from the external DMA bus to
the internal buffer. Data transfer starts when IORDY is
asserted. Inputs DREQ and DACK are ignored.
PIO Write command for ATAPI device:
Data is
transferred in PIO mode from the internal buffer to the
external DMA bus. Data transfer starts when IORDY is
asserted. Inputs DREQ and DACK are ignored.
Multiword DMA Read:
Data is transferred from the
external DMA bus to the internal buffer.
Multiword DMA Write:
Data is transferred from the
internal buffer to the external DMA bus.
Read at address 01F0H:
Initiates a PIO Read cycle
from Task File 1F0. Before issuing this command the
task file byte count should be programmed at address
1F4H (LSB) and 1F5H (MSB).
Poll BSY status bit for ATAPI device:
Starts repeated
PIO Read commands to poll the BSY status bit of the
ATAPI device. When BSY = 0, polling is terminated and
an interrupt is generated.
01
GDMA Write
02
UDMA Read
03
UDMA Write
04
PIO Read
05
PIO Write
06
MDMA Read
07
MDMA Write
0A
Read 1F0
0B
Poll BSY
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