JS28F512P30TFA datasheet(35/86 Pages) MICRON

35 / 86 page

Datasheet

Sept 2012

Order Number:208042-0

P30-65nm

11.2

Read Configuration Register (RCR) (Easy BGA)

The RCR is a 16-bit read/write register used to select bus-read mode (synchronous or

asynchronous), and to configure synchronous burst read characteristics of the device.

To modify RCR settings, use the Configure Read Configuration Register command (see

Section 6.2, “Device Command Bus Cycles” on page 20).

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.

Table 13: Read Configuration Register Description (Sheet 1 of 2)

Read Configuration Register (RCR)

Read

Mode

Latency Count

WAIT

Polarity

RES

WAIT

Delay

Burst

Seq

CLK

Edge

RES

Burst

Wrap

Burst Length

LC[3:0]

BL[2:0]

Bit

Name

Description

Read Mode (RM)

0 = Synchronous burst-mode read

1 = Asynchronous page-mode read (default)

14:11

Latency Count (LC[3:0])

0011 =Code 3

0100 =Code 4

0101 =Code 5

0110 =Code 6

0111 =Code 7

1000 =Code 8

1001 =Code 9

1010 =Code 10

1011 =Code 11

1100 =Code 12

1101 =Code 13

1110 =Code 14

1111 =Code 15 (default)

(Other bit settings are reserved)

WAIT Polarity (WP)

0 =WAIT signal is active low (default)

1 =WAIT signal is active high

Reserved (R)

Default “0”, Non-changeable

WAIT Delay (WD)

0 =WAIT deasserted with valid data

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

Burst Sequence (BS)

Default “0”, Non-changeable

Clock Edge (CE)

0 = Falling edge

1 = Rising edge (default)

5:4

Reserved (R)

Reserved bits should be cleared (0)

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