K4R271669A Datasheet, PDF (39/64 Pages) Samsung semiconductor – 256K x 16/18 bit x 2*16 Dependent Banks Direct RDRAMTM

K4R271669A/K4R441869A
Direct RDRAM^™
Control Register: SKIP
Address: 04b₁₆
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 AS MSE MS 0 0 0 0 0 0 0 0 0 0
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 t_CYCLE 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.
Figure 42: SKIP Register
Control Register: TCYCLE
Address: 04c₁₆
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
00
TCYCLE13..TCYCLE0
Read/write register.
Reset value is undefined
TCYCLE13..0 - Specifies the value of the t_CYCLE
datasheet parameter in 64ps units. For the t_CYCLE,MIN
of 2.5ns (2500ps), this field should be written with the
value “00027₁₆” (39•64ps).
Figure 44: TCYCLE Register
Control Register: TEST77
Control Register: TEST78
Control Register: TEST79
Address: 04d₁₆
Address: 04e₁₆
Address: 04f₁₆
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0000000000000000
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.
Figure 43: TEST Registers
Page 37
Rev. 1.02 Jan. 2000