W9812G6JH-6A datasheet(9/42 Pages) WINBOND

Part #	W9812G6JH-6A

Description	2M x 4 BANKS x 16 BITS SDRAM

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Manufacturer	WINBOND [Winbond]

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W9812G6JH

Publication Release Date: Jun. 25, 2013

- 9 -

Revision A06

7.11 Burst Stop Command

A Burst Stop Command may be used to terminate the existing burst operation but leave the bank open

for future Read or Write Commands to the same page of the active bank, if the burst length is full page.

Use of the Burst Stop Command during other burst length operations is illegal. The Burst Stop

Command is defined by having

RAS and CAS high with CS and WE low at the rising edge of

the clock. The data DQs go to a high impedance state after a delay which is equal to the CAS Latency

in a burst read cycle interrupted by Burst Stop.

7.12 Addressing Sequence of Sequential Mode

A column access is performed by increasing the address from the column address which is input to

the device. The disturb address is varied by the Burst Length as shown in Table 2.

Table 2 Address Sequence of Sequential Mode

DATA

ACCESS ADDRESS

BURST LENGTH

Data 0

n

BL = 2 (disturb address is A0)

Data 1

n + 1

No address carry from A0 to A1

Data 2

n + 2

BL = 4 (disturb addresses are A0 and A1)

Data 3

n + 3

No address carry from A1 to A2

Data 4

n + 4

Data 5

n + 5

BL = 8 (disturb addresses are A0, A1 and A2)

Data 6

n + 6

No address carry from A2 to A3

Data 7

n + 7

7.13 Addressing Sequence of Interleave Mode

A column access is started in the input column address and is performed by inverting the address bit

in the sequence shown in Table 3.

Table 3 Address Sequence of Interleave Mode

DATA

ACCESS ADDRESS

BURST LENGTH

Data 0

A8 A7 A6 A5 A4 A3 A2 A1 A0

BL = 2

Data 1

A8 A7 A6 A5 A4 A3 A2 A1

A0

Data 2

A8 A7 A6 A5 A4 A3 A2

A1 A0

BL = 4

Data 3

A8 A7 A6 A5 A4 A3 A2

A1 A0

Data 4

A8 A7 A6 A5 A4 A3

A2 A1 A0

BL = 8

Data 5

A8 A7 A6 A5 A4 A3

A2 A1 A0

Data 6

A8 A7 A6 A5 A4 A3

A2 A1 A0

Data 7

A8 A7 A6 A5 A4 A3

A2 A1 A0

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