cs5954am Cypress Semiconductor Corporation., cs5954am Datasheet - Page 20

• Manufacturer Part Number: cs5954am
• Description: Usb Controller For Nand Flash
• Manufacturer: Cypress Semiconductor Corporation.

4.14
The CS5954AM Controller has two built-in programmable timers that can provide an interrupt to the CS5954AM engine. The
timers decrement on every microsecond clock tick. An interrupt occurs when the timer reaches zero.
4.14.1
The CS5954AM BIOS uses the timer 0 for time-out function and power-down mode. At the end of the power-up, the CS5954AM
BIOS disables the timer 0 interrupt. If you wish to use timer 0 for power-down function, see the [Ref. 1] SL11R_BIOS for more
information.
4.14.2
The CS5954AM timer 1 is for user applications. The CS5954AM BIOS does not use this timer.
Document #: 38-08025 Rev. **
Bit 12 (ROM Merge) of the Extended Memory Controller
Register = 0
D15
D15
T15
T15
D15–0
D15–0
General Timers and Watchdog Timer
Timer 0 Count Register (0xC010: R/W)
Timer 1 Count Register (0xC012: R/W)
D14
T14
D14
T14
D13
T13
D13
T13
T15–0
T15–0
0xA000 to 0xBFFF
0xC000 to 0xC0FF
0xC100 to 0xE7FF
0x8000 to 0x9FFF
Unused Overlay
Unused Overlay
Unused Overlay
Actual External
ROM (16Kx16)
Memory Space
Memory Space
Memory Space
ROM (32Kx8)
D12
T12
D12
T12
ROM
or
D11
T11
D11
T11
Timer Count value.
Timer Count value.
D10
T10
D10
T10
ADVANCE
INFORMATION
D9
T9
D9
T9
0x0000 to 0x0C00
0x0C00 to 0x7FFF
SRAM (16K x 16)
Unused Overlay
SRAM (32K x 8)
Memory Space
Actual External
RAM
D8
or
T8
D8
T8
Bit 12 (ROM Merge) of the Extended Memory Controller
Register = 1
D7
T7
D7
T7
D6
T6
D6
T6
D5
T5
D5
T5
0xC000 to 0xC0FF
0xC100 to 0xE7FF
0x8000 to 0xBFFF
Unused Overlay
Actual External
ROM (16Kx16)
Memory Space
ROM (32Kx8)
External
Actual
ROM
ROM
D4
T4
D4
T4
or
D3
T3
D3
T3
D2
T2
D2
T2
CS5954AM
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D1
T1
D1
T1
D0
T0
D0
T0