參數(shù)資料
型號: AM79C974
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: PCnetTM -的SCSI結(jié)合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù): 90/153頁
文件大?。?/td> 838K
代理商: AM79C974
AMD
P R E L I M I N A R Y
90
Am79C974
RST
must be asserted low to start a NAND tree test se-
quence. Initially, all NAND tree inputs except
RST
should be driven high. This will result in a high output at
the
BUSY
pin. If the NAND tree inputs are driven low in
the same order as they are connected to build the NAND
tree,
BUSY
will toggle every time an additional input is
driven low.
BUSY
will change to a ZERO, when
INTA
is
driven low and all other NAND tree inputs stay high.
BUSY
will toggle back to high, when CLK is additionally
driven low.
BUSY
will continue toggling as long as the
NAND tree inputs are toggling in the sequence shown in
Figure 28.
BUSY
will be high, when all NAND tree inputs
are driven low.
When testing is complete, deassert
RST
to exit this test
mode.
Note that some of the pins connected to the NAND tree
are outputs in normal mode of operation. They must not
be driven from an external source until the PCnet-SCSI
controller is configured for NAND tree testing.
18681A-36
RST
INTA
CLK
GNTB
REQA
AD[31:0]
C/
BE
[3:0]
IDSELA
FRAME
IRDY
TRDY
DEVSEL
STOP
LOCK
PERR
SERR
PAR
FFFFFFFF
3
1
0000FFFF
F
7
INTB
GNTA
REQB
IDSELB
BUSY
PWDN
Figure 28.
NAND Tree Waveform
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