參數(shù)資料
型號(hào)： PNX8510
廠商： NXP Semiconductors N.V.
英文描述： Analog companion chip
中文描述： 模擬伴隨芯片
文件頁(yè)數(shù)： 36/92頁(yè)
文件大?。?/td> 3064K
代理商： PNX8510
Philips Semiconductors
PNX8510/11
Analog companion chip
Product data
Rev. 04 – 12 January 2004
36 of 92
9397 750 12612
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
appropriate status register. In addition to the register-driven I/O mode, some of the
GPIO pins are used to reflect the status of internal signals. Some GPIO pins are also
used as additional inputs to functional units if operated in input mode.
7.5.1
Operation
GPIO set during reset
During reset the GPIO output is disabled. GPIO_in is stored as gpio_in_stored and
retains its value until the next reset. This stored value determines the I
2
C device
addresses. After reset, GPIO pins can be programmed for output with the OEN and
OUT_SEL bits.
Checking/setting the GPIO status
Each GPIO pin is multiplexed four times to increase usability.
Figure 27
outlines the
internal structure of one GPIO pin. In output mode the selection of the signal routed
out to a GPIO pin is performed with the OUT_SEL register bits. The OEN bit is low
active and enables the GPIO output mode. If OUT_SEL is set to 2’b11 and the OEN
bit is set to zero, the GPIO pin can be set or reset by writing a one or zero into the
STATUS location of the GPIO register. All other OUT_SEL settings are listed in
Table 29
.
To read the external status of a GPIO pin, the OEN needs to be set to one to avoid
conflicts with signals routed out of the chip. If GPIO_IN_EN4 is set to one, the status
of the GPIO pin can be monitored by reading the STATUS bit of the appropriate GPIO
register. The function of all relevant GPIO_IN/OUT signals are listed in
Figure 27
and
Table 25
.
Fig 27.
Operation modes for one GPIO in the
PNX8510/11
Table 25:
Signal
gpio5_out1
gpio5_out2
gpio5_in3
Specific GPIO assignments
Description
Composite sync secondary encoder
Vertical sync primary encoder
30-bit parallel video input mode: bit[1] = red channel
MDB655
GPIO_IN_EN1
GPIO_IN4
GPIO_IN_STORED
GPIO_IN3
GPIO_IN2
GPIO_IN1
GPIO_OUT1
GPIO_OUT2
GPIO_OUT3
GPIO_OUT4
GPIO_IN_EN2
GPIO_IN_EN3
GPIO_IN_EN4
GPIO_IN
GPIO_OUT
OUT_SEL
GPIO
OEN
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