am79c960 Advanced Micro Devices, am79c960 Datasheet - Page 58

• Manufacturer Part Number: am79c960
• Description: Pcnettm-isa Single-chip Ethernet Controller
• Manufacturer: Advanced Micro Devices

Each status signal is ANDed with its corresponding
enable signal. The enabled status signals run to a com-
mon OR gate:
1-400
RVPOL E
AMD
RVPOL
RCV E
XMT E
COL E
LNK E
JAB E
RCV
XMT
COL
LNK
JAB
LED Control Logic
16907B-14
P R E L I M I N A R Y
Am79C960
The output from the OR gate is run through a pulse
stretcher, which consists of a 3-bit shift register clocked
at 38 Hz. The data input of the shift register is at logic 0.
The OR gate output asynchronously sets all three bits of
the shift register when its output goes active. The output
of the shift register controls the associated LEDx pin.
Thus, the pulse stretcher provides an LED output of
52 ms to 78 ms.