參數(shù)資料
型號(hào): ISP1161A1BM,557
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: 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): 64/137頁
文件大?。?/td> 599K
代理商: ISP1161A1BM,557
Philips Semiconductors
ISP1161A1
USB single-chip host and device controller
Product data
Rev. 03 — 23 December 2004
31 of 136
9397 750 13961
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
The data transfer can be done via the PIO mode or the DMA mode. The data transfer
rate can go up to 15 Mbyte/s. In the DMA operation, the single-cycle or multi-cycle
burst modes are supported. Multi-cycle burst modes of 1, 4, or 8 cycles per burst is
supported for the ISP1161A1.
9.4.2
Data organization
PTD data is used for every data transfer between a microprocessor and the USB bus,
and the PTD data resides in the buffer RAM. For an OUT or SETUP transfer, the
payload data is placed just after the PTD, after which the next PTD is placed. For an
IN transfer, RAM space is reserved for receiving a number of bytes that is equal to the
total bytes of the transfer. After this, the next PTD and its payload data are placed
Remark:
The PTD is dened for both ATL and ITL type data transfers. For ITL, the PTD data is
put into ITL buffer RAM, and the ISP1161A1 takes care of the Ping-Pong action for
the ITL buffer RAM access.
The PTD data (PTD header and its payload data) is a structure of DWORD (double-
word or 4-byte) alignment. This means that the memory address is organized in
blocks of 4 bytes. Therefore, the rst byte of every PTD and the rst byte of every
payload data are located at an address which is a multiple of 4. Figure 28 illustrates
an example in which the rst payload data is 14 bytes long, meaning that the last byte
of the payload data is at the location 15H. The next addresses (16H and 17H) are not
multiples of 4. Therefore, the rst byte of the next PTD will be located at the next
multiple-of-four address, 18H.
Fig 27. Buffer RAM data organization.
MGT952
PTD of OUT transfer
RAM buffer
payload data of OUT transfer
PTD of IN transfer
empty space for IN total data
PTD of OUT transfer
payload data of OUT transfer
top
bottom
000H
7FFH
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