k4r881869m Samsung Semiconductor, Inc., k4r881869m Datasheet - Page 39

• Manufacturer Part Number: k4r881869m
• Description: 288mbit Rdram 512k X 18 Bit X 2*16 Dependent Banks Direct Rdramtm
• Manufacturer: Samsung Semiconductor, Inc.

K4R881869M
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
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.
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.
15 14 13 12 11 10 9
15 14 13 12 11 10 9
0
0
Control Register: TEST77
Control Register: TEST78
Control Register: TEST79
Control Register: SKIP
0
0
0
0
AS
0
0
Figure 43: TEST Registers
Figure 42: SKIP Register
MSE MS
0
0
0
0
0
0
8
0
8
0
7
0
7
0
CYCLE
6
0
6
0
5
0
5
0
Address: 04b
Address: 04d
Address: 04e
Address: 04f
later for the four
4
0
4
0
3
0
3
0
2
0
2
0
1
0
1
0
16
16
16
16
0
0
0
0
Page 37
Read/write register.
Reset value is undefined
TCYCLE13..0 - Specifies the value of the t
datasheet parameter in 64ps units. For the t
of 2.5ns (2500ps), this field should be written with the
value “00027
15 14 13 12 11 10 9
Control Register: TCYCLE
0
0
Figure 44: TCYCLE Register
16
” (39•64ps).
TCYCLE13..TCYCLE0
8
Preliminary
Direct RDRAM
Rev. 0.9 Jan. 2000
7
6
5
Address: 04c
4
3
CYCLE,MIN
CYCLE
2
1
16
0
™