SPC7283 Epson Electronics America, Inc., SPC7283 Datasheet - Page 63

• Manufacturer Part Number: SPC7283
• Description: IEEE1394 Controller
• Manufacturer: Epson Electronics America, Inc.

Cycle Time Register
CYCLE_TIME.second_count
CYCLE_TIME.cycle_count
CYCLE_TIME. cycle.offset
Address
0x2C
0x2D
0x2E
0x2F
Each of CycSecond, CycCount, and CycOffset Registers updates the timer by updating the current value of the
cycle timer used for isochronous transfer.
When the self node is a CYCLE MASTER, set the value of each register in the CYCLE START PACKET.
When the self node is not a CYCLE MASTER, set the cycle_time_data of a received CYCLE START PACKET
on each register.
This register is enabled when LINKCtl(Hi). DisCycTimer=“0”.
Reserve this register as a CycSecond(Hi) for WORD access.
This bit field indicates an integer at the place of Second of the cycle timer.
It is enabled when the LINKCtl(H).DisCycTimer= “0” and the Cycle Second is incremented every time the
CycleCount reaches 8000. When the Cycle Second exceeds 127, it is restored to 0.
When the self node is a CYCLE MASTER and the DisCycTimer=“0”, it is incremented every time the Cycle
Offset reached 3072. When the Cycle Count reaches 8000, it is restored to 0.
When the self node is a CYCLE TIMER and the DisCycTimer=“0”, it is incremented in a cycle of 24.576MHz.
When the Cycle Offset reaches 3072, it is restored to 0 and then the Cycle Count is incremented.
CYCLE_TIME_H
CYCLE_TIME_MH
CYCLE_TIME_ML
CYCLE_TIME_L
Register Name
7: Cycle Second[6]
6: Cycle Second[5]
5: Cycle Second[4]
4: Cycle Second[3]
3: Cycle Second[2]
2: Cycle Second[1]
1: Cycle Second[0]
0: Cycle Count[12]
7: Cycle Count[11]
6: Cycle Count[10]
5: Cycle Count[9]
4: Cycle Count[8]
3: Cycle Count[7]
2: Cycle Count[6]
1: Cycle Count[5]
0: Cycle Count[4]
7: Cycle Count[3]
6: Cycle Count[2]
5: Cycle Count[1]
4: Cycle Count[0]
3: Cycle Offset[11]
2: Cycle Offset[10]
1: Cycle Offset[9]
0: Cycle Offset8[]
7: Cycle Offset[7]
6: Cycle Offset[6]
5: Cycle Offset[5]
4: Cycle Offset[4]
3: Cycle Offset[3]
2: Cycle Offset[2]
1: Cycle Offset[1]
0: Cycle Offset[0]
Bit Symbol
EPSON
R/W
R/W
R/W
R/W
CYCLE_TIME.second_count
CYCLE_TIME.cycle_count
CYCLE_TIME.cycle_offset
Description
S1R72803F00A
H.Rst S.Rst B.Rst
0x00
0x00
0x00
0x00
–
–
–
–
–
–
–
–
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