CY28316
Byte 7: Control Register 7
Bit
Bit 7
Pin#
–
Name
Reserved
Default
Pin Description
0
1
1
0
0
0
0
0
Reserved.
Bit 6
25
26
–
24_48MHz_DRV
48MHz_DRV
Reserved
0 = Norm, 1 = High Drive.
0 = Norm, 1 = High Drive.
Reserved.
Bit 5
Bit 4
Bit 3
–
Reserved
Reserved.
Bit 2
–
Reserved
Reserved.
Bit 1
–
Reserved
Reserved.
Bit 0
–
Reserved
Reserved.
Byte 8: Vendor ID and Revision ID Register (Read Only)
Bit
Name
Revision_ID3
Revision_ID2
Revision_ID1
Revision_ID0
Vendor_ID3
Vendor_ID2
Vendor _ID1
Vendor _ID0
Default
Pin Description
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
1
0
0
0
Revision ID bit[3].
Revision ID bit[2].
Revision ID bit[1].
Revision ID bit[0].
Bit[3] of Cypress’s Vendor ID. This bit is read-only.
Bit[2] of Cypress’s Vendor ID. This bit is read-only.
Bit[1] of Cypress’s Vendor ID. This bit is read-only.
Bit[0] of Cypress’s Vendor ID. This bit is read-only.
Byte 9: System RESET and Watchdog Timer Register
Bit
Name
Default
Pin Description
SDRAM clock output drive strength.
0 = Normal.
Bit 7
Bit 6
SDRAM_DRV
0
1 = High Drive.
PCI_DRV
0
PCI clock output drive strength.
0 = Normal.
1 = High Drive.
Bit 5
Bit 4
Reserved
0
0
Reserved
RST_EN_WD
This bit will enable the generation of a Reset pulse when a Watchdog Timer
time-out occurs.
0 = Disabled.
1 = Enabled.
Bit 3
RST_EN_FC
0
This bit will enable the generation of a Reset pulse after a frequency change
occurs.
0 = Disabled.
1 = Enabled.
Bit 2
Bit 1
WD_TO_STATUS
WD_EN
0
0
Watchdog Timer Time-out Status bit.
0 = No time-out occurs (Read); Ignore (Write).
1 = Time-out occurred (Read); Clear WD_TO_STATUS (Write).
0 = Stop and reload Watchdog Timer. Unlock CY28316 from recovery frequency
mode.
1 = Enable Watchdog Timer. It will start counting down after a frequency change
occurs.
Note: CY28316 will generate a system Reset, reload a recovery frequency, and
lock itself into a recovery frequency mode after a Watchdog Timer time-out
occurs. Under recovery frequency mode, CY28316 will not respond to any
attempt to change output frequency via the SMBus control bytes. System
software can unlock CY28316 from its recovery frequency mode by clearing the
WD_EN bit.
Rev 1.0,November 20, 2006
Page 7 of 17
SPECTRALINEAR [ SPECTRALINEAR INC ]
