參數(shù)資料
型號： 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
文件頁數(shù)： 29/72頁
文件大?。?/td> 656K
代理商： OX16PCI954
7 I
NTERNAL
OX16C950 UART
S
Data Sheet Revision 1.3
Page 29
OX16PCI954
OXFORD SEMICONDUCTOR LTD.
Each of the four UART channels in the OX16PCI954 operates individually as an OX16C950 high-peformance serial port. Each
channel has its own full set of registers, but all share a common clock and FIFOSEL pin. After a device reset, a common
configuration state is loaded into all four channels, but after this time each can be operated individually through its own 8-byte
block of addressable space.
7.1
Operation – mode selection
Each channel is backward compatible with the 16C450, 16C550, 16C654 and 16C750 UARTs. The operation of the ports
depends on a number of mode settings, which are referred to throughout this section. The modes, conditions and corresponding
FIFO depth are tabulated below:
UART Mode
FIFO
size
(EFR[4]=1)
450
1
0
X
550
16
1
0
Extended 550
128
1
0
650
128
1
1
750
128
1
0
950
1
128
1
1
FCR[0]
Enhanced mode
FCR[5]
(guarded with LCR[7] = 1)
X
0
X
X
1
X
FIFOSEL
pin
X
0
1
X
0
X
Table 13: UART Mode Configuration
Note 1: 950 mode configuration is identical to 650 configuration
7.1.1
After a hardware reset, bit 0 of the FIFO Control Register
(‘FCR’) is cleared, hence the UARTs are compatible with
the 16C450. The transmtter and receiver FIFOs (referred
to as the ‘Transmt Holding Register and ‘Receiver Holding
Register respectively) have a depth of one. This is referred
to as ‘Byte mode’. When FCR[0] is cleared, all other mode
selection parameters are ignored.
450 Mode
7.1.2
Connect FIFOSEL to GND. After a hardware reset, writing
a 1 to FCR[0] will increase the FIFO size to 16, providing
compatibility with 16C550 devices.
550 Mode
7.1.3
Connect FIFOSEL to VDD. Writing a 1 to FCR[0] will now
increase the FIFO size to 128, thus providing a 550 device
with 128 deep FIFOs.
Extended 550 Mode
7.1.4
For compatibility with 16C750, connect FIFOSEL to GND.
Writing a 1 to FCR[0] will increase the FIFO size to 16. In a
simlar fashion to 16C750, the FIFO size can be further
750 Mode
increased to 128 by writing a 1 to FCR[5]. Note that access
to FCR[5] is protected by LCR[7]. i.e., to set FCR[5],
software should first set LCR[7] to temporarily remove the
guard. Once FCR[5] is set, the software should clear
LCR[7] for normal operation.
The 16C750 additional features are available as long as
the UART is not put into Enhanced mode; i.e. ensure
EFR[4] = ‘0’. These features are:
Deeper FIFOs
Automatic RTS/CTS out-of-band flow control
Sleep mode
7.1.5
The OX16C950 is compatible with the 16C650 when
EFR[4] is set, i.e. the device is in Enhanced mode. As 650
software drivers usually put the device in Enhanced mode,
running 650 drivers on the one of the UART channels will
result in 650 compatibility with 128 deep FIFOs, as long as
FCR[0] is set. This is regardless of the state of the
FIFOSEL pin. Note that the 650 emulation mode of the
OX16PCI954 provides 128-deep FIFOs rather than the 32
provided by a legacy 16C654.
650 Mode
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