MPC852TADS Freescale Semiconductor, MPC852TADS Datasheet - Page 56

• Manufacturer Part Number: MPC852TADS
• Description: Networking Modules & Development Tools ADS BOARD FOR 852
• Manufacturer: Freescale Semiconductor
• Type: Network Controller & Processorr

Specifications of MPC852TADS

• Memory Type: Flash, SDRAM
• Interface Type: RS-232, Ethernet, PCMCIA
• Operating Voltage: 1.8 V to 3.3 V
• Operating Temperature Range: 0 C to + 30 C
• Board Size: 233 mm x 150 mm
• Product: Modules
• For Use With/related Products: MPC852T
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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differs from those of the SDRAM when address line mapping for 32-bits is being read.
MPC address bits A11:21 are mapped to MPC lines A19:29 as row addresses via the UPM Register AMx =0b000.
Starting with the MPC line A21 connection to A8 SD and MPC A20 to A9 SD, it is necessary to provide for the
leftover row address A10 SD. This is not done through use of MPC line A19 as that would show MPC A10 as a mul-
tiplexed row address but, rather, as described above by using GPL0. In the UPM Register MxMR the GPL0 is pro-
grammed to show MPC A10 with complete row addressing.
In this case the SDRAM device has four banks. On occasion, a single 32-bit SDRAM bank does not provide enough
application memory. Connecting multiple 32-bit SDRAM-based banks to the MPC852T is fairly straightforward as
is extending the above noted interface.
The most significant row address bit, MPC BS SD.A10, is connected due to the 19-bit address size (8/11 address mul-
tiplex!) covered by the selected SDRAM device. SDRAM devices with two BS lines, BS0 SD and BS1 SD, must use
the next address bit, e.g. MPC A10, A9 in order to keep the memory mapping linear. All in all, address lines are used
for binary encoding of the bank selection.
TABLE 4-6. SDRAM ADD and MPC852T Pin Correlations
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Functional Description
A9, A10
A11:A21
A22:A29
MPC852TADS - User’s Manual
MPC8xx
BS1, BS0
11 ROW
8 Column
SDRAM
Release 1.0