MPC821 datasheet(46/242 Pages) NXP

46 / 242 page

Functional Description

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

To support hot-insertionA the socket’s power is controlled via a dedicated PCMCIA power controller

the LTC1315 made by LINEAR TECHNOLOGY. This device, controlled by BCSR1, switches 12V

VPP for card programming and controls gates of external MOSFET transistors, through which the PC

Card VCC is switched.

When a card is inserted while the channel is enabled via BCSR1, i.e., both of the CD(1:2)* (Card

Detect) lines are asserted (low), the status of the voltage select lines VS(1:2)* should be read to de-

termine the PC Card’s operation voltage level according to which, PCCVCC(0:1) bits in BCSR1

should be set, to drive the correct VCC (5V) to the PC-Card.

When a card is being removed from the socket while the channel is enabled via BCSR1, the negation

of CD1~ and CD2~ may be sensed by the MPC and power supply to the card may be cut.

WARNNING

Any application S/W handling the PCMCIA channel

must check the Voltage-Sense lines before Power

is applied to the PC-Card. Otherwise, if 5V power is

applied to a 3.3V-Only card, permanent damage will

be inflicted to the PC-Card.

4•11

Board Control & Status Register - BCSR

Most of the hardware options on the MPC8XXFADS are controlled or monitored by the BCSR, which

is a 32B bit wide read / write register file. The BCSR is accessed via the MPC’s CS1 region and in

fact includes 5 registers: BCSR0 to BCSR4. Since the minimum block size for a CS region is

32KBytes, BCSR0 - BCSR4 are multiply duplicated within that region. See also TABLE 3-1.

"MPC8XXADS Main Memory Map" on page 17.

The following functions are controlled / monitored by the BCSR:

MPC’s Hard Reset Configuration.

Flash Module Enable / Disable

Dram Module Enable / Disable

Dram port width - 32 bit / 16 bit.

SDRAM Module Enable / Disable.

Ethernet port Enable / Disable.

Infra-Red port Enable / Disable.

RS232 port 1 Enable / Disable.

RS232 port 2 Enable / Disable.

10) BCSR Enable / Disable.

11) Hard Reset Configuration Source - BCSR0 / FlashC Memory

12) PCMCIA control which include:

•

Channel Enable / Disable.

•

PC Card VCC appliance.

•

PC Card VPP appliance.

13) USBD Port Enable or UtopiaE Port Enable or 100-Base-TF Port Enable

A. I.e., card insertion when the FADS is powered

B. In fact only the upper 16 bits - D(0:15) are used, but the BCSR is mapped as a 32 bit wide register and should

be accessed as such.

C. Provided that support is provided also within the MPC.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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