IS46LR16640C datasheet(33/47 Pages) ISSI

33 / 47 page

Rev. 0A | October 2022

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IS43/46LR32320C

IS43/46LR16640C

Figure17 : Read Burst terminate (BL=4 or 8)

Truncated Reads

Data from any READ burst may be truncated with a BURST TERMINATE command, as shown in Figure16. The BURST TERMINATE

latency is equal to the READ (CAS) latency, i.e., the BURST TERMINATE command should be issued x cycles after the READ command,

where x equals the number of desired data element pairs (pairs are required by the 2n-prefetch architecture).

Data from any READ burst must be completed or truncated before a subsequent WRITE command can be issued. If truncation is

necessary, the BURST TERMINATE command must be used.

A READ burst may be followed by, or truncated with, a PRECHARGE command to the same bank provided that auto precharge was not

activated. The PRECHARGE command should be issued x cycles after the READ command, where x equals the number of desired data

element pairs (pairs are required by the n-prefetch architecture). This is shown in Figure (READ to PRECHARGE). Following the

PRECHARGE command, a subsequent command to the same bank cannot be issued until tRP is met.

Figure16 : Random Read access

Notes:

1. Dout n or m,p,q = Data-Out from Column n or m,p,q

2. BL=2,4,8 (if 4 or 8, the following burst interrupts the previous)

3. Reads are to an Active row in any bank.

4. Shown with nominal tAC, tDQSCK and tDQSQ

Notes:

1. Dout n = Data-Out from Column n

2. CKE=high

3. Shown with nominal tAC, tDQSCK and tDQSQ

Bank a

COL m

Bank a

COL p

DOUT

Bank a

COL q

Bank a

COL n

READ

NOP

READ

Address

/CLK

CLK

CL=3

Command

DQS

Don’t care

DOUT

n+1

DOUT

m+1

NOP

DOUT

q+1

DOUT

p+1

Bank a

COL n

NOP

READ

BST

NOP

Address

/CLK

CLK

CL=3

Command

DQS

Don’ t care

D OUT

n+1

DOUT

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