參數(shù)資料
型號: ISP1161BM
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: Full-speed Universal Serial Bus single-chip host and device controller
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-414-1, LQFP-64
文件頁數(shù): 51/127頁
文件大小: 2762K
代理商: ISP1161BM
Philips Semiconductors
ISP1161
Full-speed USB single-chip host and device controller
Product data
Rev. 01 — 3 July 2001
51 of 130
9397 750 08313
Philips Electronics N.V. 2001. All rights reserved.
In DACK-only mode the ISP1161 DC uses the DACK2 signal as a data strobe. Input
signals RD and WR are ignored. This mode is used in CPU systems that have a
single address space for memory and I/O access. Such systems have no separate
MEMW and MEMR signals: the RD and WR signals are also used as memory data
strobes.
12.4 End-Of-Transfer conditions
12.4.1
Bulk endpoints
A DMA transfer to/from a bulk endpoint can be terminated by any of the following
conditions (bit names refer to the DMA Configuration Register, see
Table 85
):
An external End-Of-Transfer signal occurs on input EOT
The internal DMA Counter Register reaches zero (CNTREN = 1)
A short/empty packet is received on an enabled OUT endpoint (SHORTP = 1)
DMA operation is disabled by clearing bit DMAEN.
External EOT:
When reading from an OUT endpoint, an external EOT will stop the
DMA operation and
clear any remaining data
in the current FIFO. For a double-
buffered endpoint the other (inactive) buffer is not affected.
When writing to an IN endpoint, an EOT will stop the DMA operation and the data
packet in the FIFO (even if it is smaller than the maximum packet size) will be sent to
the USB host at the next IN token.
DMA Counter Register zero:
An EOT from the DMA Counter Register is enabled by
setting bit CNTREN in the DMA Configuration Register. The ISP1161 has a 16-bit
DMA Counter Register, which specifies the number of bytes to be transferred. When
EOT
RD
WR
End-Of-Transfer
read strobe
write strobe
I
I
I
DMA controller terminates the transfer
not used
not used
Fig 39. ISP1161’s device controller in DACK-only DMA mode.
Table 12: DACK-only mode: pin functions
…continued
Symbol
Description
I/O
Function
RAM
ISP1161
DEVICE
CONTROLLER
DMA
CONTROLLER
CPU
DREQ2
DACK2
HRQ
HLDA
HRQ
HLDA
DREQ
DACK
RD
WR
004aaa010
D0 to D15
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