S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 121

• Manufacturer Part Number: S1D13505
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Epson Research and Development
Vancouver Design Center
bit 4
bits 3-2
Hardware Functional Specification
Issue Date: 01/02/02
REG[22h] bit 4
RAS#-to-CAS# Delay Value (N
This bit selects the DRAM RAS#-to-CAS# delay parameter, t
(N
access time, t
N
Note that for EDO-DRAM and N
N
The resulting t
t
t
t
t
RAS# Precharge Timing Value (N
Minimum Memory Timing for RAS# precharge
These bits select the DRAM RAS# Precharge timing parameter, t
(N
assume an MCLK duty cycle of 50 +/- 5%.
N
The resulting t
t
t
RCD
RCD
RCD
RCD
RP
RP
RCD
RCD
RP
0
1
RCD
RP
) of MCLK periods (T
. This is done to satisfy the CAS# address setup time, t
) of MCLK periods (T
= Round-Up((t
= 2
= Round-Up(t
= Round-Up(t
RAC
Table 8-13: RAS#-to-CAS# Delay Timing Select
RC
RC
= (N
= (1.5) T
= (N
= (N
= 1
= 1.5
= 2
= (N
= (N
. Note, these formulae assume an MCLK duty cycle of 50 +/- 5%.
is related to N
is related to N
RCD
RCD
RCD
RP
RP
) T
+ 0.5) T
) T
) T
M
+ 0.5) T
RAC
RAC
M
RAC
M
M
M
) used to create t
M
/T
/T
if (t
if 1
if (t
) used to create t
+ 5)/T
M
M
M
RCD
RCD
RP
RP
RP
RP
N
M
- 1)
- 0.45)
RP
RCD
as follows:
2
1
(t
/T
/T
)
= 1.5, this bit is automatically forced to 0 to select 2 MCLK for
) Bits [1:0]
as follows:
RP
M
M
M
if EDO and N
if EDO and N
if FPM and N
if FPM and N
if FPM refresh cycle and N
for all other
/T
) < 1
)
- 1)
M
1.45
) < 1.45
RP
RCD
– see the following formulae. Note, these formulae
. N
if EDO and N
if EDO and N
if FPM and N
if FPM and N
RP
RP
RP
RP
RCD
RAS#-to-CAS# Delay (t
= 1 or 2
= 1.5
= 1 or 2
= 1.5
must be chosen to satisfy the RAS#
ASC
RCD
.
RP
RP
RP
RP
RP
RP
. This bit specifies the number
. These bits specify the number
2
1
= 1 or 2
= 1.5
= 1 or 2
= 1 or 2
= 1.5
RCD
)
X23A-A-001-14
S1D13505
Page 115