S5935QF Applied Micro Circuits Corporation, S5935QF Datasheet - Page 122

• Manufacturer Part Number: S5935QF
• Manufacturer: Applied Micro Circuits Corporation

Specifications of S5935QF

• Package Type: PQFP
• Rad Hardened: No
• Lead Free Status / Rohs Status: Not Compliant

S5935 – PCI Product
For the examples below, we will assume the S5935 is
I/O mapped with a base address of FC00h. These
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This example will write 1 byte from NVRAM location 0040h and read it back:
In
Out
Out
Out
Out
Out
Out
Out
In
Out
In
In
DS1527
FC00h + 3Fh (offset of NVRAM Access Control Register) until D31 = 0 (not busy).
FC00h + 3FH an 80h (CMD to load the low address byte). This sets decode bits and opens door for low address
latch.
FC00h + 3Eh (offset of Address/Data Register) 40h (the low byte of the address desired) 40h goes into latch but is
not latched yet.
FC00h + 3Fh an A0h (CMD to load the high address byte). This latches the low address through changing the
decode bits and opens the door for the high address latch.
FC00h + 3Eh a 00h (the high byte of the address desired). 00h goes into the latch but is not latched yet.
FC00h + 3Fh an 00h (inactive CMD). This latches the high address through the disabling D31, ‘closes the door’.
FC00h + 3Eh DATA (the data byte to be written). DATA byte goes into the latch but is not latched yet.
FC00h + 3Fh a C0h (CMD to write the data byte). This latches the data byte through changing the decode bits and
begins to write NVRAM data operation.
FC00h + 3Fh until D31 = 0 (not busy).
FC00h + 3Fh an E0h (CMD to read the address latched).
FC00h + 3Fh until D31 = 0 (not busy).
FC00h + 3Eh the data.
examples will read one byte of the Vendor ID and write
one byte to the Vendor ID.
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