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| 型號(hào)： | S5933Q/7C |
| 廠商： | APPLIEDMICRO INC |
| 元件分類： | 總線控制器 |
| 英文描述： | PCI BUS CONTROLLER, PQFP160 |
| 封裝： | PLASTIC, QFP-160 |
| 文件頁(yè)數(shù)： | 44/327頁(yè) |
| 文件大?。?/td> | 1976K |
| 代理商： | S5933Q/7C |
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Applied Micro Circuits Corporation
6195 Lusk Blvd., San Diego, CA 92121 (619) 450-9333
9-9
PCI CONTROLLER
S5933
DEVICE SPECIFICATION
9.5.2 Accessing Non-Volatile Memory
The nv memory, if implemented, can be accessed
through the PCI interface or the Add-On interface.
Accesses from both the PCI side and the Add-On
side must be synchronous with the PCI clock
(BPCLK for the Add-On). Accesses to the nv memory
from the PCI interface are through the Bus Master
Control/Status Register (MCSR) PCI Operation Reg-
ister. Accesses to the nv memory from the Add-On
interface are through the Add-On General Control/
Status Register (AGCSTS) Add-On Operation Regis-
ter.
Accesses to the MCSR register are from the PCI bus
and are, therefore, automatically synchronous to the
PCI clock. Accesses to the AGCSTS register from
the Add-On side must be synchronous with respect
to BPCLK (as described in Section 9.1.4).
Some nv memories may contain Expansion ROM
BIOS code for use by the host software. During ini-
tialization, the Expansion BIOS is located within sys-
tem memory. The starting location of the nv memory
is stored in the Expansion ROM Base Address Reg-
ister in the S5933 PCI Configuration Registers. A PCI
read from this region results in the S5933 performing
four consecutive byte access to the nv memory de-
vice. Writes to the nv memory are not allowed by
writing to this region. Writes to the nv memory must
be performed as described below.
The S5933 contains two latches within the MCSR
register to control and access the NVRAM. One is an
8 bit latch called the NVRAM Address/Data Register
which is used to hold NVRAM address and data in-
formation. The other is a 3 bit latch called the
NVRAM Access Control Register which is used to
direct the address and data information and to control
the NVRAM itself. Reading or writing to the NVRAM
is performed through bits D31:29 of this register.
These bits are enable and decode controls rather
than a command or instruction to be executed. D31
of this register is the primary enable bit which allows
all accesses to occur. When written to a ‘1’, D31
enables the decode bits D30 and D29 to direct the
data contained in the address/data latch, D23:16, to
the low address, high address or data latches. D31
should be thought of as “opening a door” where as
long as D31 = 1, then the door is open for address
or data information to be altered. The table on page
5-16 of the S5933 data book shows the D31:29 bit
combinations for reading, writing, and loading ad-
dress/data information. Additionally, D31 doubles as
an S5933 status bit. A ‘1’ indicates that the S5933 is
currently busy reading or writing to the NVRAM. A
‘0’ indicates a complete or inactive state.
For the examples below, we will assume the S5933
is I/O mapped with a base address of FC00h. These
examples will read one byte of the Vendor ID and
write one byte to the Vendor ID.
In
FC00h + 3Fh (offset of NVRAM Access Control Register) until D31 = 0 (not busy).
Out
FC00h + 3FH an 80h (CMD to load the low address byte). This sets decode bits and opens door for
low address latch.
Out
FC00h + 3Eh (offset of Address/Data Register) 40h (the low byte of the address desired) 40h goes
into latch but is not latched yet.
Out
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.
Out
FC00h + 3Eh a 00h (the high byte of the address desired). 00h goes into the latch but is not latched
yet.
Out
FC00h + 3Fh an 00h (inactive CMD). This latches the high address through the disabling D31,
‘closes the door’.
Out
FC00h + 3Eh DATA (the data byte to be written). DATA byte goes into the latch but is not latched
yet.
Out
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.
In
FC00h + 3Fh until D31 = 0 (not busy).
Out
FC00h + 3Fh an E0h (CMD to read the address latched).
In
FC00h + 3Fh until D31 = 0 (not busy).
In
FC00h + 3Eh the data.
This example will write 1 byte from NVRAM location 0040h and read it back:
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