MPC821 datasheet(58/242 Pages) NXP

58 / 242 page

Functional Description

MPC8XXFADS Design Specification—Rev 0.1

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

residing over the daughter boards, providing visibility towards daughter boards’ and external logic.

BCSR4 fields are described in TABLE 4-23. "BCSR4 Description" on page 56.

A. Provided that BCSR is not disabled.

TABLE 4-23. BCSR4 Descriptiona

BIT

MNEMONIC

Function

PON

DEF

ATT.

ETHLOOP

Ethernet port Diagnostic Loop-Back. When active (high), the MC68160

EEST is conﬁgured into diagnostic Loop-Back mode, where the transmit

output is internally fed back into the receive section.

R,W

TFPLDL~

Twisted Pair Full-Duplex. When active (low), the MC68160 EEST is put

into full-duplex mode, where, simultaneous receive and transmit are

enabled.

R,W

TPSQEL~

Twisted Pair Signal Quality Error Test Enable. When active (low), a

simulated collision state is generated within the EEST, so the collision

detection circuitry within the EEST may be tested.

R,W

SIGNAL_LAMP

Signal Lamp. When this signal is active (low), a dedicated LED illuminates.

When in-active, this led is darkened. This led is used for S/W signalling to

user.

R,W

USB_ENb

UTOPIA_ENc

FETH_ENd

USB port Enable or Utopia Port Enable or Fast Ethernet Port Enable.

When this signal is active (low) it enables the USB port transceiver in case

an MPC823 daughter board is attached to the FADS or it enables the

Utopia port in case an MPC860SAR daughter board is attached to the

FADS or it enables the Fast Ethernet Port (100-Base-T) if an MPC860T

daughter board is connected.

This signal has no function with the MPC801, MPC821 and MPC860

daughter boards.

R,W

USB_SPEED

USB Port Speed. When this signal is active (high) the USB transceiver of

the MPC823 daughter board is in full-speed mode. When inactive, the USB

transceiver is in low-speed mode.

This signal has no function with any daughter board other the MPC823 or

MPC850 daughter boards.

R,W

USB_VCC0

USB Port VCC EN. When this signal is active (low), 5V power is enabled to

the USB port. When inactive, power to the USB port is disconnected.

This signal has no function with any daughter board other the MPC823 or

MPC850 daughter boards.

R,W

Reserved.

Implemented.

R,W

VIDEO_ON

Video Port Enable. When this signal is active (low), the Video-On Led on

the MPC823FADSDB is lit. When inactive, the led is darkened. This is

merely an indication that should be set by application S/W to indicate

activity of the Video Port, after it has been enabled via the I2C port.

This signal has no function with any daughter board other the MPC823

daughter board.

R,W

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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