MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 359

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

18.4.2 DCR Initialization
At power-up, the DCR has the following configuration if synchronous operation and SDRAM
address multiplexing are desired.
This configuration results in a value of 0x0026 for DCR, as shown in
18.4.3 DACR Initialization
As shown in
of each 1-Mbyte partition in the SDRAM (each 16 Mbytes). The starting address of the SDRAM
is 0xFF88_0000. Continuous page mode feature is used.
Freescale Semiconductor
15–1
10–9
Bits
8–0
MCF5235
Pins
SDRAM
Pins
13
12
11
4
Setting
(hex)
Field
Name
RTIM
NAM
COC
RC
—
IS
—
15
Figure
0
A15
A0
Setting
—
14
0x26
0
00
00
0
0
0
18-12, the SDRAM is programmed to access only the second 512-Kbyte block
A14
A1
NAM COC
13
0
Reserved.
Indicating SDRAM controller multiplexes address lines internally
SD_CKE is used as clock enable instead of command bit because user is not multiplexing
address lines externally and requires external command feed.
At power-up, allowing power self-refresh state is not appropriate because registers are being
set up.
Because t
Specification indicates auto-refresh period for 4096 rows to be 64 mS or refresh every 15.625
µs for each row, or 625 bus clocks at 40 MHz. Because DCR[RC] is incremented by 1 and
multiplied by 16, RC = (625 bus clocks/16) -1 = 38.06 = 0x38
Table 18-26. SDRAM Hardware Connections
Figure 18-11. Initialization Values for DCR
A13
A2
12
Table 18-27. DCR Initialization Values
0
RC
A12
A3
IS
11
0
MCF5235 Reference Manual, Rev. 2
value is 70 ns, indicating a 3-clock refresh-to-
A11
10
A4
0
RTIM
A10
0
9
A5
0
8
A9
A6
0026
0
7
Description
A17
A7
0
6
A18
A8
5
1
A19
A9
RC
ACTV
0
4
Table
A10 = CMD
timing.
0
3
A20
18-27.
1
2
BA0
A21
SDRAM Example
1
1
BA1
A22
0
0
18-21