參數(shù)資料
型號(hào)： OX16PCI954
廠商： Electronic Theatre Controls, Inc.
英文描述： Integrated Quad UART and PCI interface
中文描述： 綜合四UART和PCI接口
文件頁(yè)數(shù)： 56/72頁(yè)
文件大?。?/td> 656K
代理商： OX16PCI954
10 S
ERIAL
EEPROM
Data Sheet Revision 1.3
Page 56
OX16PCI954
OXFORD SEMICONDUCTOR LTD.
10.1 Specification
The OX16PCI954 can be configured using an optional
serial electrically-erasable programmable read only
memory (EEPROM). If the EEPROMis not present, the
device will remain in its default configuration after reset.
Although this may be adequate for some applications,
many will benefit fromthe degree of programmability
afforded by this feature.
The EEPROMinterface is based on the 93C46/56 serial
EEPROMdevices which have a proprietary serial interface
known as Mcrowire
TM
. The interface has four pins which
supply the memory device with a clock, a chip-select, and
serial data input and output lines. In order to read from
such a device, a controller has to output serially a read
command and address, then input serially the data. The
93C46/56 and compatible devices have a 16-bit data word
format but differ in memory size (and number of address
bits).
The OX16PCI954 incorporates a controller module which
reads data fromthe serial EEPROMand writes data into
the configuration register space. It performs this operation
in a sequence which starts immediately after a PCI bus
reset and ends either when the controller finds no
EEPROMis present or when it reaches the end of its data.
The operation of this controller is described below.
Following device configuration, driver software can access
the serial EEPROMthrough four bits in the device-specific
Local Configuration Register LCC[27:24]. Software can use
this register to manipulate the device pins in order to read
and modify the EEPROMcontents.
The OX16PCI954 requires a total of 82 bytes of EEPROM
data to programall the EEPROMwritable registers. Note
that 93C46 and 93C56 EEPROMdevices offer 128 and
256 bytes of programmable data respectively.
A Windows
based utility to programthe EEPROMis
available. For further details please contact Oxford
Semconductor (see back cover).
Mcrowire
TM
is a trade mark of National Semconductor. For
a description of McroWire, please refer to National
Semconductor data manuals.
10.2 EEPROMData Organisation
The serial EEPROMdata is divided in four zones. The size
of each zone is an exact multiple of 16-bit WORDs. Zone0
is allocated to the header. A valid EEPROMprogrammust
contain a header. The EEPROMcan be programmed from
the PCI bus. Once the programmng is complete, the
device driver should either reset the PCI bus or set
LCC[29] to reload the OX16PCI954 registers fromthe
serial EEPROM. The general EEPROMdata structure is
shown in Table 31.
DATA
Zone
0
One
Header
1
One or more
Local Configuration Registers
2
One to four
Identification Registers
3
Two or more
PCI Configuration Registers
Size (Words)
Description
Table 31: EEPROMdata format
10.2.1 Zone0: Header
The header identifies the EEPROMprogramas valid.
Bits
Description
15:4 These bits should return 0x950 to identify a valid
program Once the OX16PCI954 reads 0x950
fromthese bits, it sets LCC[28] to indicate that a
valid EEPROMprogramis present.
3
Reserved. Write ‘0’ to this bit.
2
1 = Zone1 (Local Configuration) exists
0 = Zone1 does not exist
1
1 = Zone2 (Identification) exists
0 = Zone2 does not exist
0
1 = Zone3 (PCI Configuration) exists
0 = Zone3 does not exist
The programmng data for each zone follows the
proceeding zone if it exists. For example a Header value of
0x9507 indicates that all zones exist and they follow one
another in sequence, while 0x9505 indicates that only
Zones 1 and 3 exist where the header data is followed by
Zone1 WORDs, and since Zone2 is mssing Zone1
WORDs are followed by Zone3 WORDs.
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