KM416RD8AS-RBM80 datasheet(40/64 Pages) SAMSUNG

40 / 64 page

Page 37

KM416RD8AS

Direct RDRAM™

Rev. 0.9 July 1999

Target

Figure 42: SKIP Register

Figure 43: TEST Registers

15 14 13 12 11 10

AS MSE MS

Read/write register (except AS field).

Reset value is zero (SIO Reset).

AS - Autoskip. Read-only value determined by

autoskip circuit and stored when SETF serial command

is received by RDRAM during initialization. In figure

58, AS=1 corresponds to the early Q(a1) packet and

AS=0 to the Q(a1) packet one tCYCLE later for the four

uncertain cases.

MSE - Manual skip enable (0=auto, 1=manual).

MS - Manual skip (MS must be 1 when MSE=1).>

During initialization, the RDRAMs at the furthest point

in the fifth read domain may have selected the AS=0

value, placing them at the closest point in a sixth read

domain. Setting the MSE/MS fields to 1/1 overrides

the autoskip value and returns them to the furthest

point of the fifth read domain.

Control Register: SKIP

Address: 04b16

15 14 13 12 11 10

Read/write registers.

Reset value of TEST78,79 is zero ( SIO Reset).

Do not read or write TEST78,79 after SIO reset.

TEST77 must be written with zero after SIO reset.

These registers must only be used for testing purposes.

Control Register: TEST77

Address: 04d16

Control Register: TEST78

Address: 04e16

Control Register: TEST79

Address: 04f16

Figure 44: TCYCLE Register

15 14 13 12 11 10

TCYCLE13..TCYCLE0

Read/write register.

Reset value is undefined

TCYCLE13..0 - Specifies the value of the tCYCLE

datasheet parameter in 64ps units. For the tCYCLE,MIN

of 2.5ns (2500ps), this field should be written with the

value “0002716” (39•64ps).

Control Register: TCYCLE

Address: 04c16

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