isp1161bm NXP Semiconductors, isp1161bm Datasheet - Page 55

• Manufacturer Part Number: isp1161bm
• Description: Isp1161 Full-speed Universal Serial Bus Single-chip Host And Device Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 24:
9397 750 09567
Product data
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
HCFmNumber register: bit allocation
31
23
15
0
7
0
10.2.3 HcFmNumber register (R: 0FH)
Table 23:
The HcFmNumber register is a 16-bit counter. It provides a timing reference for
events happening in the HC and the HCD. The HCD may use the 16-bit value
specified in this register and generate a 32-bit frame number without requiring
frequent access to the register.
Code (Hex): 0F — read
Table 25:
Bit
31
30 to 14
13 to 0
Bit
31 to 16
15 to 0
30
22
14
0
6
0
HcFmRemaining register: bit description
HcFmNumber register: bit description
Symbol
FRT
-
FR[13:0]
Symbol
FN[15:0]
29
21
13
0
5
0
Rev. 02 — 13 December 2002
Description
FrameRemainingToggle: This bit is loaded from the
FrameIntervalToggle field of HcFmInterval whenever
FrameRemaining reaches 0. This bit is used by the HCD for
synchronization between FrameInterval and FrameRemaining.
reserved
FrameRemaining: This counter is decremented at each bit time.
When it reaches zero, it is reset by loading the FrameInterval value
specified in HcFmInterval at the next bit time boundary. When
entering the USBOPERATIONAL state, the HC reloads it with the
content of the FrameInterval part of the HcFmInterval register and
uses the updated value from the next SOF.
Description
reserved
FrameNumber: This is incremented when HcFmRemaining is
reloaded. It will be rolled over to 0H after FFFFH. When the
USBOPERATIONAL state is entered, this will be incremented
automatically. HC will set the StartofFrame in HcInterruptStatus.
Full-speed USB single-chip host and device controller
28
20
12
0
4
0
reserved
reserved
FN[15:8]
FN[7:0]
00H
00H
R
R
R
R
27
19
11
0
3
0
26
18
10
0
2
0
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
25
17
9
0
1
0
ISP1161
55 of 137
24
16
8
0
0
0