EP9315-CB Cirrus Logic Inc, EP9315-CB Datasheet - Page 506

• Manufacturer Part Number: EP9315-CB
• Description: IC ARM920T MCU 200MHZ 352-PBGA
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9315-CB

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, PCMCIA, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LCD, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 8x12b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 352-BGA
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: EDB9315A-Z
• For Use With: 598-1144 - KIT DEVELOPMENT EP9315 ARM9
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1261

13
13-10
SDRAM, SyncROM, and SyncFLASH Controller
EP93xx User’s Guide
13.8.2 Address/Data/Control Required by Memory System
An independent device configuration register, "SDRAMDevCfg[3:0]", "SDRAMDevCfg[3:0]",
"SDRAMDevCfg[3:0]", and "SDRAMDevCfg[3:0]", is provided for each of the four
synchronous memory domains. Each domain can be configured for either an SDRAM,
SyncROM, or SyncFLASH device type. Only one device type can be configured per domain.
However, different domains can be configured for different device types.
Each of the four synchronous memory domains can be configured to be either 16- or 32-bits
wide and each will support 32-bit (word), 16-bit (half-word), and 8-bit (byte) accesses to or
from the synchronous memory device. If the external memory bus is 16-bits wide, two
external bus accesses are automatically made to Read or Write a 32-bit word. This is why a
burst-of-eight accesses is used to Read or Write devices that are attached to a 16-bit bus
while only a burst-of-four accesses is used to Read or Write devices that are attached to a
32-bit bus.
When writing to external memory, byte lane enable signals are output on the nDQM[3:0] pins,
where the DQMn0 pin controls the least-significant byte lane, the DQMn1 pin controls the
next to least-significant byte lane, the DQMn2 pin controls the next to most- significant byte
lane, and the DQMn3 pin controls the most-significant byte lane. The memory device uses
the byte lane enable signals on the DQMn pins to determine which byte lane data it should
accept during a Write operation. For example, if a 32-bit word is to be written to a memory
device on a 32-bit memory bus, DQMn[3:0] = ‘0000’ is output to alert the memory device that
it should accept Write data from all four byte lanes. However, if an 8-bit byte is to be written to
the next to least-significant byte of a memory device on a 32-bit bus, DQMn[3:0] = ‘1101’ is
output to alert the memory device that it should accept Write data from only the next to least-
significant byte lane and reject Write data from the other byte lanes. As another example, if a
32-bit word is to be written to a memory device on a 16-bit data bus, two 16-bit writes are
automatically performed to the memory device. For each 16-bit Write, DQM[1:0] = ‘00’ and
DQM[3:2] are not used.
device with 13-row x 9-column x 2-bank addressing attached to a 16-bit memory bus. Note
Table 13-10
Boot Option
(ASDO)
X
X
X
0
shows a memory addressing example for a 256 Mbit synchronous memory
A31
1
1
1
1
Table 13-9. Chip Select Decoding
Copyright 2007 Cirrus Logic
A30
1
1
1
1
A29
1
1
0
0
A28
1
0
1
0
Chip select
nSDCS3
nSDCS2
nSDCS1
nSDCS0
DS785UM1