ISP1362EE/01 PHILIPS [NXP Semiconductors], ISP1362EE/01 Datasheet - Page 17

• Manufacturer Part Number: ISP1362EE/01
• Description: Single-chip Universal Serial Bus On-The-Go controller
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
9397 750 12337
Product data
Figure 5
block size of 64 bytes. The HCD may put a PTD with payload size of up to 64 bytes
but not more. Depending on the ATL or INTL buffer size, up to 32 ATL blocks and
32 INTL blocks can be allocated. Note that a portion of the ATL or INTL buffer
remains unused. This is allowed but can be avoided by choosing the appropriate ATL
or INTL buffer size and block size.
The ISTL0 or ISTL1 buffer memory (for isochronous transfer) uses a different
memory management scheme (see
ISTL buffer memory. While the PTD header remains 8 bytes for all PTDs, the PTD
payload can be of any size. The PTD payload, however, is padded to the next DWord
boundary when the HC calculates the location of the next PTD header. The
ISP1362 HC checks the payload size from the ‘Total size’ field of the PTD itself and
calculates the location of the next PTD header based on this information.
Fig 5. A sample snapshot of the ATL or INTL memory management scheme.
provides a snapshot of a sample ATL or INTL buffer area of 256 bytes with a
ATL or INTL buffer area
Starting address of the
Rev. 03 — 06 January 2004
64 bytes PTD header
64 bytes PTD header
8 bytes PTD header
64 bytes PTD header
8 bytes PTD header
8 bytes PTD header
Payload area
Payload area
Payload area
Figure
004aaa055
6). There is no fixed block size for the
Single-chip USB OTG controller
Block of 72 bytes
(64 + 8,
72 bytes
72 bytes
where 64 is the block size defined)
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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