AM79C976 datasheet(31/309 Pages) AMD

31 / 309 page

8/01/00

Am79C976

P R E L I M INARY

Note: The SFBD signal can be programmed to appear

on any of the LED pins.

RXFRTGD

Receive Frame Tag Data

Input

When the EADI is enabled (EADISEL, BCR2, bit 3) and

the Receive Frame Tagging is enabled (RXFRTG,

CSR7, bit 14), the RXFRTGD pin becomes a data input

pin for the Receive Frame Tag. See the Receive Frame

Tagging section for details.

Note: The RXFRTGD pin is multiplexed with the LED3

and EEDO pins.

RXFRTGE

Receive Frame Tag Enable

Input

When the EADI is enabled (EADISEL, BCR2, bit 3) and

the Receive Frame Tagging is enabled (RXFRTG,

CSR7, bit 14), the RXFRTGE pin becomes a data input

enable pin for the Receive Frame Tag. See the Receive

Frame Tagging section for details.

Note: The RXFRTGE pin is multiplexed with the LED2

pin.

IEEE 1149.1 (1990) Test Access Port

Interface

TCK

Test Clock

Input

TCK is the clock input for the boundary scan test mode

operation. It can operate at a frequency of up to 10

MHz. TCK has an internal pull-up resistor.

TDI

Test Data In

Input

TDI is the test data input path to the Am79C976 con-

troller. The pin has an internal pull-up resistor.

TDO

Test Data Out

Output

TDO is the test data output path from the Am79C976

controller. The pin is tri-stated when the JTAG port is in-

active.

TMS

Test Mode Select

Input

A serial input bit stream on the TMS pin is used to

define the specific boundary scan test to be executed.

The pin has an internal pull-up resistor.

Power Supply Pins

AVDD

Analog Power (1 Pin)

Power

This power supply pin is used for the internal oscillator

and phase-locked loop circuits. This pin must be

connected to a +3.3-V supply.

VSSB

I/O Buffer Ground (25 Pins)

Power

There are 25 ground pins that are used by the input/

output buffer drivers.

VDD

Digital and I/O Buffer Power (24 Pins)

Power

There are 24 power supply pins that are used by the in-

ternal digital circuitry and I/O buffers. All VDD pins must

be connected to a +3.3 V supply.

VSS

Digital Ground (8 Pins)

Power

There are eight ground pins that are used by the inter-

nal digital circuitry.

AM79C976 Datasheet(PDF) 31 Page - Advanced Micro Devices

AM79C976 Datasheet(HTML) 31 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL