CS5535 datasheet(504/555 Pages) NSC

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Flash Controller Register Descriptions (Continued)

5.19.1.2 NOR Flash Timing MSRs

The NOR Flash controller is used for NOR Flash or GPCS. The timing is different from device to device, so separate timing

registers are used for each device.

NOR Flash Timing for Chip Selects 0 and 1 (NORTF_T01)

MSR Address

51400019h

Type

R/W

Reset Value

07770777h

NORTF_T01 Register Map

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

9876543210

RSVD

tH1

tP1

tS1

RSVD

tH0

tP0

tS0

NORTF_T01 Bit Descriptions

Bit

Name

Description

31:27

RSVD

Reserved. Reads return value written.

26:24

Th1 (Note 1)

Note 1. The valid range for the count values of setup time, and hold time in NOR MSR registers is 1 through 7 (Local Bus

clock cycles or LPC clock cycles) when a General Purpose device is used (with NOR Controller). If signal

FLASH_IOCHRDY is not used by the General Purpose device, then the valid range for the count value of pulse

width in NOR MSR registers is 1 through 7 (Local Bus clock cycles or LPC clock cycles). If FLASH_IOCHRDY is

used by the General Purpose device, then the valid range for the count value of pulse width in NOR MSR registers

is 2 through 7 (Local Bus clock cycles or LPC clock cycles). In the case of NOR devices, as NOR Controller doesn’t

support the use of FLASH_IOCHRDY (explained in Section 4.18.2 "NOR Flash Controller/General Purpose Chip

Select" on page 171),the valid range for the count values of setup time, pulse width, and hold time in NOR MSR

registers is 1 through 7 (Local Bus clock cycles or LPC clock cycles).In the case of NOR Controller’s WE# and RE#

strobe pulse widths, if NOR Control MSR register bits[7:4] (CHKRDY[3:0]) are enabled (active high) in the case of

General Purpose devices then the generated pulse widths will be longer than programmed count value. If setup or

hold time in NOR MSR registers is programmed as 0, then the NOR Controller’s WE# and RE# generation will use

16 as the count value of NOR setup or hold time.

Hold Time for NOR Chip Select 1. Hold from WE# or RE# rising edge to chip select.

Refer to Figure 4-58 "NOR Flash with Wait States Timing" on page 173.

RSVD

Reserved. Reads return value written

22:20

Tp1

Strobe Pulse Width for NOR Chip Select 1. RE# and WE# strobe pulse width. At the end

of the Tp, sample the IOCHRDY pin to see if a wait state is needed. Refer to Figure 4-58

"NOR Flash with Wait States Timing" on page 173.

RSVD

Reserved. Reads return value written.

18:16

Ts1 (Note 1)

Setup Time for NOR Chip Select 1. Chip select to WE# or RE# falling edge setup time.

Refer to Figure 4-58 "NOR Flash with Wait States Timing" on page 173.

15:11

RSVD

Reserved. Reads return value written.

10:8

Th0 (Note 1)

Hold time for NOR Chip Select 0. Hold from WE# or RE# rising edge to chip select. Refer

to Figure 4-58 "NOR Flash with Wait States Timing" on page 173.

RSVD

Reserved. Reads return value written.

6:4

Tp0

Strobe Pulse Width for NOR Chip Select 0. RE# and WE# strobe pulse width. At the end

of the Tp, sample the IOCHRDY pin to see if a wait state is needed. Refer to Figure 4-58

"NOR Flash with Wait States Timing" on page 173.

RSVD

Reserved. Reads return value written.

2:0

Ts0 (Note 1)

Setup Time for NOR Chip Select 0. Chip select to WE# or RE# falling edge setup time.

Refer to Figure 4-58 "NOR Flash with Wait States Timing" on page 173.

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