isp1760 NXP Semiconductors, isp1760 Datasheet - Page 38

• 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
8.2.12 INT PTD Skip Map register (R/W: 0144h)
8.2.13 INT PTD Last PTD register (R/W: 0148h)
8.2.14 ATL PTD Done Map register (R: 0150h)
8.2.15 ATL PTD Skip Map register (R/W: 0154h)
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 28
Table 28:
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.
The bit description of the register is given in
Table 29:
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.
Table 30
Table 30:
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.
The bit description of the register is given in
Bit
31 to 0
Bit
31 to 0
Bit
31 to 0 ATL_PTD_DONE
Symbol
_MAP[31:0]
shows the bit description of the INT PTD Skip Map register.
shows the bit description of the ATL PTD Done Map register.
Symbol
INT_PTD_SKIP_
MAP[31:0]
Symbol
INT_PTD_LAST
_PTD[31:0]
INT PTD Skip Map register: bit description
INT PTD Last PTD register: bit description
ATL PTD Done Map register: bit description
Rev. 01 — 8 November 2004
Access
R/W
Access
R
Access
R/W
Value
0000 0000h INT PTD Last PTD: Last PTD of the
Value
FFFF FFFFh
Value
0000 0000h
Table
Table
Embedded Hi-Speed USB host controller
Description
32 PTDs as indicated by the 32 bitmap.
1h — One PTD in INT
2h — Two PTDs in INT
3h — Three PTDs in INT.
29.
31.
Description
INT PTD Skip Map: Skip map for each
of the 32 PTDs for the INT transfer
Description
ATL PTD Done Map: Done map for
each of the 32 PTDs for the ATL transfer
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
ISP1760
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