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參數資料
| 型號： | OX16PCI952-TQFP-A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Integrated High Performance Dual UARTs, Parallel Port and 5.0v PCI interface |
| 中文描述： | 集成高性能的雙UART，并行端口和5.0V PCI接口 |
| 文件頁數： | 58/76頁 |
| 文件大?。?/td> | 1386K |
| 代理商： | OX16PCI952-TQFP-A |
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9.1.2
Zone 1 allows each UART and the Parallel Port of the
OX16PCI952 to be pre-configured, prior to any PCI
accesses. This is very useful when these functions need to
run with (typically generic) device drivers and these drivers
are not capable of utilising the enhanced features/modes of
these logical units. For example, the 950 mode of the
UARTs offer high performance. Generic UART drivers will
be unable to enable the 950 mode since this requires
setting of registers outside the register definition within the
generic device drivers. By using function access, the
relevant UART registers can be accessed (setup) via the
eepromto enable/customze these features before control
is handed to these device drivers.
Each 8-bit (function) access is equivalent to accessing
each UART and/or the parallel port through its assigned I/O
BAR (base address register), with the exception that a
function read access does not return any data (it is
discarded internally). The UARTs and the parallel port
behave as though these function accesses via the eeprom
were corresponding read/write pci accesses.
Each entry for Function Access Zone comprises 2 16 bit
words (word pairs), with the exception when ending this
zone that requires a single word (all 0’s) for ‘termnation.
The format is as shown.
Word
Bits
Description
1
15
‘1’ - Function Access Word Pair available.
‘0’ – End Function Access Zone*(over to next
available zone or end eepromdownload)
1
14:12
BAR number to access
000 for BAR 0
(UART0 or parallel port I/O BAR)
001 for BAR
1 (UART1 or parallel port IO BAR)
Others reserved
.
1
11
‘0’ : Read access required
(data will be discarded)
‘1’ : Write access required
1
10:8
Function Number, requiring access.
000 – Function 0 (UARTs)
001 – Function 1 (Parallel Port)
Others Reserved
.
1
7:0
I/O address to access
This is the address that needs to be
written/read and is the offset address fromthe
specified BAR.
E.g to access SPR register of UART, address
is 00000111 (7dec).
DataSheet Revision 1.1
Page 58
OX16PCI952
OXFORD SEMICONDUCTOR LTD.
Zone 1: Function Access
1
st
WORD of FUNCTION ACCESS PAIR
Word
2
Bits
15
Description
‘1’
2
2
14:8
7:0
Reserved – write 0’s
Data to be written to specified address.
Field is unused for function access READS
(set to 0’s for reads)
2
nd
WORD of FUNCTION ACCESS PAIR
Function Access Examples
1) Enable Internal loopback, of UART 0 (Enable bit 4, of
UART 0’s MCR register).
1000100000000100
1000000000010000
1
st
Word: Function Number = 000, BAR No = 000 (UART0),
Write Access, Address=00000100 (MCR reg).
2
nd
Word: Data to be written=00010000
2) (Continue). Enable FIFO of UART 1 (Enable bit 0, of
UART 1’s FCR register)
1001100000000010
1000000000000001
1
st
Word: Function Number = 000, BAR No = 001 (UART1),
Write access, address=00000010 (FCR reg)
2
nd
Word: Data to be written=00000001
3) (Continue). Read IER Register, UART 0. End Function
Access Zone
1000000000000001
(Function Access Word Pair)
1000000000000000
0000000000000000
(End function Access zone*
1
st
Word
:
Function Number = 000,
BAR No =000 (UART0),
Read access, address=00000001 (IER reg)
2
nd
Word: No data to be written (as read access). Read
data is discarded
*When ending Function Access Zone, only a single word is
required (not word pairs) and all fields must be zeros. See
example 3.
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