MPC821 datasheet(51/242 Pages) NXP

51 / 242 page

Functional Description

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

a. Shaded areas are additions with respect to the MPC8XXFADS.

b. In case a Single Bank DRAM SIMM is used CS3~ is free as well.

c. Provided that this option is supported by the MPC by driving address lines low and asserting

CS0~ during Hard-Reset.

d. It is written in BCSR3.

10 - 11

PCCVPP(0:1)

PC Card VPP. These signals determine the voltage applied to the PCMCIA

card’s VPP. Possible values are 0 / 5 / 12 V. For the encoding of these lines

and their associated voltages see

TABLE 4-12. "PCCVPP(0:1)

Encoding" on page 49.

’11’

R,W

Dram_Half_Word

Dram Half Word. When this bit is active (low) and the steps listed in

4•6•1

"DRAM 16 Bit Operation" on page 32, are taken, the DRAM becomes

16 bit wide. When inactive the DRAM is 32 bit wide.

R,W

RS232EN_2

RS232 port 2 Enable. When asserted (low) the RS232 transceiver for port

2, is enabled. When negated, the RS232 transceiver for port 2, is in standby

mode and the relevant MPC communication port pins are available for off-

board use via the expansion connectors.

R,W

SDRAMEN

SDRAM Enable. When this bit is active (high), the SDRAM module is

enabled on the local memory map. When in-active, the DRAM is place in

low-power mode, in fact removed from the local memory map, allowing its

associated CS line, to be used off-board via the expansion connectors.

R,W

PCCVCC1

Pc Card VCC Select 1. These signal in conjunction with PCCVCC0

determine the voltage applied to the PCMCIA card’s VCC. Possible values

are 0 / 3.3 / 5 V. For the encoding of these lines and their associated

voltages see

TABLE 4-11. "PCCVCC(0:1) Encoding" on page 49.

R,W

16 - 31

Reserved

Un-implemented

TABLE 4-11. PCCVCC(0:1) Encoding

PCCVCC(0:1)

PC-Card VCC

[V]

3.3

TABLE 4-12. PCCVPP(0:1) Encoding

PCCVPP(0:1)

PC Card VPP

[V]

TABLE 4-10. BCSR1 Descriptiona

BIT

MNEMONIC

Function

PON

DEF

ATT.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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