IS43LD16640C datasheet(28/142 Pages) ISSI

28 / 142 page

IS43/46LD16640C

IS43/46LD32320C

Integrated Silicon Solution, Inc. — www.issi.com

Rev. C

07/02/2021

® Long-term Support

World Class Quality

Refresh (per bank): Starts with registration of a REFRESH (per bank) command and ends when tRFCpb is met. After tRFCpb is

met, the bank is in the idle state.

Refresh (all banks): Starts with registration of a REFRESH (all banks) command and ends when tRFCab is met. After tRFCab is

met,

the device is in the all banks idle state.

Idle MR reading: Starts with registration of the MRR command and ends when tMRR is met. After tMRR is met, the device is in

the all

banks idle state.

Resetting MR reading: Starts with registration of the MRR command and ends when tMRR is met. After tMRR is met, the device

is in

the all banks idle state.

Active MR reading: Starts with registration of the MRR command and ends when tMRR is met. After tMRR is met, the bank is in

the active state.

MR writing: Starts with registration of the MRW command and ends when tMRW is met. After tMRW is met, the device is in the all

banks idle state.

Precharging all: Starts with registration of a PRECHARGE ALL command and ends when

tRP is met. After tRP is met, the device is in the all banks idle state.

6. Bank-specific; requires that the bank is idle and no bursts are in progress.

7. Not bank-specific; requires that all banks are idle and no bursts are in progress.

8. Not bank-specific.

9. This command may or may not be bank specific. If all banks are being precharged, they must be in a valid state for precharg-

ing.

10. If a PRECHARGE command is issued to a bank in the idle state, tRP still applies.

11. A command other than NOP should not be issued to the same bank while a burst READ or burst WRITE with auto precharge

is enabled.

12. The new READ or WRITE command could be auto precharge enabled or auto precharge disabled.

13. A WRITE command can be issued after the completion of the READ burst; otherwise, a BST must be issued to end the

READ prior to asserting a WRITE command.

14. Not bank-specific. The BST command affects the most recent READ/WRITE burst started by the most recent READ/WRITE

command, regardless of bank.

15. A READ command can be issued after completion of the WRITE burst; otherwise, a BST must be used to end the WRITE

prior to asserting another READ command.

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