isp1760 NXP Semiconductors, isp1760 Datasheet - Page 37

• Manufacturer Part Number: isp1760
• Description: Hi-speed Universal Serial Bus Host Controller For Embedded Applications
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13257
Product data sheet
8.2.10 ISO PTD Last PTD register (R/W: 0138h)
8.2.11 INT PTD Done Map register (R: 0140h)
8.2.9 ISO PTD Skip Map register (R/W: 0134h)
Table 24:
This register represents a direct map of the done status of the 32 PTDs. The bit
corresponding to a certain PTD will be set to logic 1 as soon as that PTD execution is
completed. Reading the Done Map register will clear all the bits that are set to logic 1, and
the next reading will reflect the updated status of new executed PTDs.
Table 25
Table 25:
When a bit in the PTD Skip Map is set to logic 1 that PTD will be skipped although its V bit
may be set. The information in that PTD is not processed. For example, NextPTDPointer
will not affect the order of processing of PTDs. The Skip bit should not be normally set on
the position indicated by NextPTDPointer.
Table 26
Table 26:
Once the LastPTD bit corresponding to a PTD is set, this will be the last PTD processed
(checking V = 1) in that PTD category. Subsequently, the process will restart with the first
PTD (of that group). This is useful to reduce the time in which all the PTDs (the respective
memory space) would be checked, especially if only a few PTDs are defined. The
LastPTD bit must be normally set to a higher position than any other position indicated by
the NextPTDPointer from an active PTD.
The bit description of the register is given in
Table 27:
Bit
31 to 0
Bit
31 to 0
Bit
31 to 0
Bit
31 to 0
shows the bit description of the register.
shows the bit description of the ISO PTD Last PTD register.
Symbol
ISO_PTD_LAST_
PTD[31:0]
Symbol
ISO_PTD_DONE_
MAP[31:0]
Symbol
ISO_PTD_SKIP_
MAP[31:0]
Symbol
INT_PTD_DONE_
MAP[31:0]
ISO PTD Done Map register: bit description
ISO PTD Skip Map register: bit description
ISO PTD Last PTD register: bit description
INT PTD Done Map register: bit description
Rev. 01 — 8 November 2004
Access
R/W
Access
R/W
Access Value
R
Access
R
0000 0000h ISO PTD Done Map: Done map for each
Value
FFFF FFFFh
Value
0000 0000h
Value
0000 0000h INT PTD Done Map: Done map for each
Table
Embedded Hi-Speed USB host controller
27.
Description
of the 32 PTDs for the ISO transfer
Description
ISO PTD last PTD: Last PTD of the
32 PTDs is indicated by the 32 bitmap.
1h — One PTD in ISO
2h — Two PTDs in ISO
4h — Three PTDs in ISO.
Description
of the 32 PTDs for the INT transfer
Description
ISO PTD Skip Map: Skip map for each
of the 32 PTDs for the ISO transfer.
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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