Datasheet

6. COMMANDS
All commands (address and control signals) are registered on the positive edge of clock (crossing of CK going high and CK going
low). Figure 6 shows basic timing parameters for all commands.
Table 7, Table 8 and Table 9 provide a quick reference of available commands.
Table 10 and Table 11 provide the current state / next state information. This is followed by a verbal description of each command.
NAME (FUNCTION)
CS RAS CAS
WE
BA A10/AP ADDR NOTES
DESELECT (NOP) H X X X X X X 2
NO OPERATION (NOP) L H H H X X X 2
ACTIVE (Select Bank and activate row) L L H H Valid Row Row
READ (Select bank and column and start read burst) L H L H Valid L Col
READ with AP (Read Burst with Auto Precharge) L H L H Valid H Col 3
WRITE (Select bank and column and start write burst) L H L L Valid L Col
WRITE with AP (Write Burst with Auto Precharge) L H L L Valid H Col 3
BURST TERMINATE or enter DEEP POWER DOWN L H H L X X X 4, 5,12
PRECHARGE (Deactivate Row in selected bank) L L H L Valid L X 6
PRECHARGE ALL (Deactivate rows in all banks) L L H L X H X 6
AUTO REFRESH or enter SELF REFRESH L L L H X X X 7, 8, 9
MODE REGISTER SET L L L L Valid Op-code 10
Table 7 – Truth Table -Commands
Notes:
1. All states and sequences not shown are illegal or reserved.
2. DESELECT and NOP are functionally interchangeable.
3. Auto precharge is non-persistent. A10 High enables Auto precharge, while A10 Low disables Auto precharge.
4. Burst Terminate applies to only Read bursts with Autoprecharge disabled. This command is undefined and should not be
used for Read with Auto precharge enabled, and for Write bursts.
5. This command is BURST TERMINATE if CKE is High and DEEP POWER DOWN entry if CKE is Low.
6. If A10 is low, bank address determines which bank is to be precharged. If A10 is high, all banks are precharged and
BA0~BA1 are don’t care.
7. This command is AUTO REFRESH if CKE is High and SELF REFRESH if CKE is low.
8. All address inputs and I/O are ‘don’t care’ except for CKE. Internal refresh counters control bank and row addres
sing.
9. All banks must be precharged before issuing an AUTO-REFRESH or SELF REFRESH command.
10. BA0 and BA1 value select between MRS and EMRS.
11. CKE is HIGH for all commands shown except SELF REFRESH and DEEP POWER-DOWN.
FUNCTION DM DQ
NOTES
Write Enable L Valid 1
Write Inhibit H X 1
Table 8 –Truth Table – DM operations
Notes:
1. Used to mask write data, provided coincident with the corresponding
data.
AS4C32M16MD1A-5BCN
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Rev.1.2 July 2016