am79c974 Advanced Micro Devices, am79c974 Datasheet - Page 88

• Manufacturer Part Number: am79c974
• Description: Pcnettm-scsi Combination Ethernet And Scsi Controller For Pci Systems
• Manufacturer: Advanced Micro Devices

NAND Tree Testing
The Am79C974 controller provides a NAND tree test
mode to allow checking connectivity to the device on a
printed circuit board. The NAND tree is built on all PCI
bus signals (see Figure 27 and Table 8).
88
(pin 120)
(pin 117)
(pin 118)
(pin 121)
(pin 54)
(pin 56)
(pin 57)
(pin 58)
PWDN
AMD
INTA
INTB
RST
CLK
AD2
AD1
AD0
+5 V
Figure 27. Am79C974 NAND Tree Test Structure
P R E L I M I N A R Y
Am79C974
PCnet-SCSI
Core
The NAND tree testing is enabled by asserting RST. All
PCI bus signals will become inputs when RST is as-
serted. The result of the NAND tree test can be ob-
served on the BUSY pin.
BUSY
B
A
MUX
S
O
18681A-35
BUSY
(pin 62)