Sundance SMT398 - Manual (Page 28)

Version 1.2.0 Page 28 of 52 SMT398 User Manual
Each chip is available in 3 different sizes (up to 164Mbits chips are expected)
QDR part number Size in
bits
Size in
Bytes
Actual
Memory
size Amount
of
memory
per board
CY7C1302V25 8Mb 1MBytes 512kx18 2 MBytes
k7q1636(18)52a 16Mb 2MBytes 1Mx18 4 MBytes
k7q3236(18)52m.pdf 32Mb 4MBytes 2Mx18 4 MBytes
Table 3: QDR RAM sizes
Due to a board layout issue the total available QDR RAM is 2 Mbytes or 4Mbytes
with the 32Mb chips fitted.
QQ[36:0]
QD[36:0]
QSA[21:0]
QWn/QRn
QC/QCn (input)
QK/QKn (output) 2
2
R = 50 Ohms
V
TERM = V
REF/2
R = 50 Ohms
V
T
= V
REF/2
36
36
20 20
C/
C
n
K/
Kn
Ctrl
Ad
d
r
D Q
QDR1
18
18
20
C/
C
n
K/
Kn
Ctrl
Ad
d
r
D Q
QDR2
18
18
Figure 9:SMT398 QDR Width expansion arrangement.