JS28F128P30TF75A datasheet(35/90 Pages) MICRON

35 / 90 page

Datasheet

Apr 2010

Order Number:208033-02

P30-65nm SBC

RCR contents can be examined using the Read Device Identifier command, and then

reading from offset 0x05 (see Section 7.2, “Read Device Identifier” on page 22).

Upon power-up or exit from reset, the RCR defaults to asynchronous mode.

The RCR is shown in Table 13. The following sections describe each RCR bit function.

11.2.1

Read Mode (RCR.15)

The Read Mode (RM) bit selects synchronous burst-mode or asynchronous page-mode

operation for the device. When the RM bit is set, asynchronous page mode is selected

(default). When RM is cleared, synchronous burst mode is selected.

Table 13: Read Configuration Register Description

Read Configuration Register (RCR)

Read

Mode

RES

Latency Count

WAIT

Polarity

Data

Output

Config

WAIT

Delay

Burst

Seq

CLK

Edge

RES

Burst

Wrap

Burst Length

LC[3:0]

DOC

BL[2:0]

Bit

Name

Description

Read Mode (RM)

0 = Synchronous burst-mode read

1 = Asynchronous page-mode read (default)

Reserved (R)

Set to 0. This bit cannot be altered by customer.

13:11

Latency Count (LC[2:0])

000 =Code 0 reserved

001 =Code 1 reserved

010 =Code 2

011 =Code 3

100 =Code 4

101 =Code 5

110 =Code 6

111 =Code 7(default)

WAIT Polarity (WP)

0 =WAIT signal is active low

1 =WAIT signal is active high (default)

Data Output Configuration

(DOC)

0 =Data held for a 1-clock data cycle

1 =Data held for a 2-clock data cycle (default)

WAIT Delay (WD)

0 =WAIT deasserted with valid data

1 =WAIT deasserted one data cycle before valid data (default)

Burst Sequence (BS)

0 =Reserved

1 =Linear (default)

Clock Edge (CE)

0 = Falling edge

1 = Rising edge (default)

5:4

Reserved (R)

Set to 0. This bit cannot be altered by customer.

Burst Wrap (BW)

0 =Wrap; Burst accesses wrap within burst length set by BL[2:0]

1 =No Wrap; Burst accesses do not wrap within burst length (default)

2:0

Burst Length (BL[2:0])

001 =4-word burst

010 =8-word burst

011 =16-word burst

111 =Continuous-word burst (default)

(Other bit settings are reserved)

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