MCF5272CVM66J Freescale Semiconductor, MCF5272CVM66J Datasheet - Page 196

• Manufacturer Part Number: MCF5272CVM66J
• Description: IC MCU 166MHZ 196MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF527xr

Specifications of MCF5272CVM66J

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 66MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SPI, UART/USART, USB
• Peripherals: DMA, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (4K x 32)
• Program Memory Type: ROM
• Ram Size: 1K x 32
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 196-MAPBGA
• Processor Series: MCF527x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
• Cpu Speed: 66MHz
• Embedded Interface Type: EMI, ETHERNET, I2C, SPI, UART, USB
• Digital Ic Case Style: MAPBGA
• No. Of Pins: 196
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

SDRAM Controller
9.4
SDRAMs can have up to four banks addressed by SDBA1 and SDBA0. The two uppermost address lines
of the memory space are mapped to SDBA1 and SDBA0. Specific address lines mapped depend on the
size of the SDRAM array and are defined in the SDCR.
Each of the four bank address registers holds the page address (lower bits of row address) of an activated
page. Each bank can have one open page. A device with two banks can have two open pages. A device
with four banks can have four open pages.
The lower addresses of the row address are compared against the page address register content. If it does
not match, the SDRAM controller precharges the open page on the accessed bank and activates the new
required page. After this, the SDRAM controller executes the
page address register of the bank is updated. This is called a page miss.
After a bank is activated, it remains activated until the next page access causing a page miss.
A precharge of a deactivated bank is allowed and simply ignored by the SDRAM.
If a memory access is to an open page only the
called a page hit.
In two-page SDRAMs, banks 2 and 3 are invalid and must not be addressed. To avoid address aliasing, the
user should restrict the chip select address range to the space available in the SDRAMs.
9.5
The SDRAM configuration register (SDCR) and the SDRAM timing register (SDTR) are described in the
following sections. Note that SDRAM provides a mode register that is not part of the SDRAM controller
memory model. The SDRAM mode register is automatically configured during initialization.
9.5.1
SDCR is used to configure the SDRAM controller address multiplexers for the type of SDRAM devices
used on the system board.
Table 9-7
9-6
Reset
Write
Addr
R/W
SDRAM Banks, Page Hits, and Page Misses
SDRAM Registers
describes SDCR fields.
SDRAM Configuration Register (SDCR)
15
—
0
14
MCAS
00
MCF5272 ColdFire
13
Figure 9-3. SDRAM Configuration Register (SDCR)
12
00
—
11
®
Integrated Microprocessor User’s Manual, Rev. 3
10
Read/Write
BALOC
001
READ
MBAR + 0x0182
8
or
WRITE
GSL
7
0
READ
command is issued to the SDRAM. This is
6
—
00
or
5
WRITE
REG
4
0
command. Concurrently, the
INV SLEEP ACT
1
3
Freescale Semiconductor
Read-only
2
0
0
1
INIT
R/W
0
0