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PCI7421 Datasheet(PDF) 211 Page - Texas Instruments

Part # PCI7421
Description  DUAL SINGLE SOCKET CARDBUS AND ILTRAMEDIA CONTROLLER WITH INTEGRATED 1304-A - CONTROLLER WITH DEDICATED FLASH MEDIA SOCKET
PDF  298 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCI7421 Datasheet(HTML) 211 Page - Texas Instruments

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8−31
8.34 Isochronous Cycle Timer Register
The isochronous cycle timer register indicates the current cycle number and offset. When the PCI7x21/PCI7x11
controller is cycle master, this register is transmitted with the cycle start message. When the PCI7x21/PCI7x11
controller is not cycle master, this register is loaded with the data field in an incoming cycle start. In the event that
the cycle start message is not received, the fields can continue incrementing on their own (if programmed) to maintain
a local time reference. See Table 8−26 for a complete description of the register contents.
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Name
Isochronous cycle timer
Type
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
Default
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
Isochronous cycle timer
Type
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
Default
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Register:
Isochronous cycle timer
Offset:
F0h
Type:
Read/Write/Update
Default:
XXXX XXXXh
Table 8−26. Isochronous Cycle Timer Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
31−25
cycleSeconds
RWU
This field counts seconds [rollovers from bits 24−12 (cycleCount field)] modulo 128.
24−12
cycleCount
RWU
This field counts cycles [rollovers from bits 11−0 (cycleOffset field)] modulo 8000.
11−0
cycleOffset
RWU
This field counts 24.576-MHz clocks modulo 3072, that is, 125
µs. If an external 8-kHz clock
configuration is being used, then this field must be cleared to 0s at each tick of the external clock.



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