Integrated Silicon Solution, Inc. — www.issi.com —
1-800-379-4774
9
PRELIMINARY INFORMATION Rev. 00J
03/03/09
IS42S32400B
Current State
CSCS
CSCS
CS
RAS RAS
RAS RAS
RAS
CASCAS
CASCAS
CAS
WEWE
WEWE
WE Address Command Action
Idle H X X X X DESL Nop or Power Down
(2)
L H H H X NOP Nop or Power Down
(2)
L H H L X BST Nop or Power Down
L H L H BA, CA, A10 READ/READA ILLEGAL
(3)
L H L L A, CA, A10 WRIT/ WRITA ILLEGAL
(3)
L L H H BA, RA ACT Row activating
L L H L BA, A10 PRE/PALL Nop
L L L H X REF/SELF Auto refresh or Self-refresh
(4)
L L L L OC, BA1=L MRS Mode register set
Row Active H X X X X DESL Nop
LHHH X NOP Nop
LHHL X BST Nop
L H L H BA, CA, A10 READ/READA Begin read
(5)
L H L L BA, CA, A10 WRIT/ WRITA Begin write
(5)
L L H H BA, RA ACT ILLEGAL
(3)
L L H L BA, A10 PRE/PALL Precharge
Precharge all banks
(6)
L L L H X REF/SELF ILLEGAL
L L L L OC, BA MRS ILLEGAL
Read H X X X X DESL Continue burst to end to
Row active
L H H H X NOP Continue burst to end Row
Row active
L H H L X BST Burst stop, Row active
L H L H BA, CA, A10 READ/READA Terminate burst,
begin new read
(7)
L H L L BA, CA, A10 WRIT/WRITA Terminate burst,
begin write
(7,8)
L L H H BA, RA ACT ILLEGAL
(3)
L L H L BA, A10 PRE/PALL Terminate burst
Precharging
L L L H X REF/SELF ILLEGAL
L L L L OC, BA MRS ILLEGAL
Write H X X X X DESL Continue burst to end
Write recovering
L H H H X NOP Continue burst to end
Write recovering
L H H L X BST Burst stop, Row active
L H L H BA, CA, A10 READ/READA Terminate burst, start read :
Determine AP
(7,8)
L H L L BA, CA, A10 WRIT/WRITA Terminate burst, new write :
Determine AP
(7)
L L H H BA, RA RA ACT ILLEGAL
(3)
L L H L BA, A10 PRE/PALL Terminate burst Precharging
(9)
L L L H X REF/SELF ILLEGAL
L L L L OC, BA MRS ILLEGAL
FUNCTIONAL TRUTH TABLE
Note: H=VIH, L=VIL x= VIH or VIL, V = Valid Data, BA= Bank Address, CA+Column Address, RA=Row Address, OC= Op-Code
