ISP1362EE/01 PHILIPS [NXP Semiconductors], ISP1362EE/01 Datasheet - Page 57
ISP1362EE/01
Manufacturer Part Number
ISP1362EE/01
Description
Single-chip Universal Serial Bus On-The-Go controller
Manufacturer
PHILIPS [NXP Semiconductors]
Datasheet
1.ISP1362EE01.pdf
(150 pages)
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13.4.3 End-Of-Transfer conditions
11. The 8237 places the bus control signals (MEMR, MEMW, IOR and IOW) and the
12. The CPU acknowledges control of the bus by deasserting HLDA. After activating
For a typical bulk transfer, the preceding process is repeated 32 times, once for each
word. After each word, the DcAddress register in the DMA controller is incremented
by two and the byte counter is decremented by two. When using the 16-bit DMA, the
number of transfers is 32 and address incrementing and byte counter decrementing
is done by two for each word.
Bulk endpoints:
of the following conditions (bit names refer to the DcDMAConfiguration register, see
Table 118
DcDMACounter register — An EOT from the DcDMACounter register is enabled by
setting bit CNTREN of the DcDMAConfiguration register. The DC has a 16-bit
DcDMACounter register, which specifies the number of bytes to be transferred. When
DMA is enabled (DMAEN = 1), the internal DMA counter is loaded with the value from
the DcDMACounter register. When the internal counter completes the transfer as
programmed in the DMA counter, an EOT condition is generated and the DMA
operation stops.
Short packet — Normally, the transfer byte count must be set using a control
endpoint before any DMA transfer takes place. When a short packet has been
enabled as EOT indicator (SHORTP = 1), the transfer size is determined by the
presence of a short packet in the data. This mechanism permits the use of a fully
autonomous data transfer protocol.
When reading from an OUT endpoint, reception of a short packet at an OUT token
will stop the DMA operation after transferring the data bytes of this packet.
Table 19:
[1]
EOT condition
DcDMACounter register
Short packet
DMAEN bit of the
DcDMAConfiguration register
•
•
•
The DMA transfer completes as programmed in the DcDMACounter register
(CNTREN = 1)
A short packet is received on an enabled OUT endpoint (SHORTP = 1)
DMA operation is disabled by clearing the DMAEN bit.
address lines in three-state and deasserts the HRQ signal, informing the CPU
that it has released the bus.
the bus control lines (MEMR, MEMW, IOR and IOW) and the address lines, the
CPU resumes the execution of instructions.
The DMA transfer stops. No interrupt, however, is generated.
and
Summary of EOT conditions for a bulk endpoint
Table
Rev. 03 — 06 January 2004
A DMA transfer to or from a bulk endpoint can be terminated by any
119):
OUT endpoint
transfer completes as
programmed in the
DcDMACounter register
short packet is received and
transferred
DMAEN = 0
[1]
Single-chip USB OTG controller
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
IN endpoint
transfer completes as
programmed in the
DcDMACounter register
counter reaches zero in
the middle of the buffer
DMAEN = 0
ISP1362
[1]
57 of 150
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