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| 型号： | DSRT-L030-011 |
| 厂商： | CONEXANT SYSTEMS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, XMA |
| 文件页数： | 52/86页 |
| 文件大小： | 667K |
| 代理商： | DSRT-L030-011 |
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RipTide PCI Audio/Comm Device Family Product Description
56
ROCKWELL PROPRIETARY INFORMATION
1167
7.2.2.1
Legacy Joystick Control Process
Pins JAX, JAY, JBX, and JBY, are one-shot timers that generate pulses of varying widths, where the width corresponds to the
current resistance of a potentiometer within a joystick. When the host processor writes to the game port, the timer pins
discharge external capacitors and set an internal flip-flop output to a 1. When the capacitor charges up to the internal
threshold voltage (0.63VCC or one RC time constant), the internal flip-flop is reset to 0. The RC time constant is determined
by the joystick potentiometer value and an external RC circuit. The host is required to periodically read the game port address
for push button status and calculate the X and Y coordinate based on the duration of the timer flip-flop output bit being high.
This is CPU intensive and uses up a large number of CPU cycles. The CPU is used as a counter to sample, then measure,
time in order to calculate the position of the joystick, as noted above.
Table 20. Analog (legacy) Joystick Port Register Map
7654
3210
JB2
JB1
JA2
JA1
JBY
JBX
JAY
JAX
7.3
Host Modem Interface
The Host Modem interface may be used as a Target by the Host to access control and status of the Modem Function
(Function 1) and the Modem DSP.
PCI Bus Master mode is supported for DMA transfer of modem related data.
Modem function operates as memory slave and bus master for PC memory accesses.
The Modem function uses a 64K-byte memory mapped address space that may be located anywhere in the 32-bit address
range and is not pre-fetchable.
7.3.1
Host and RipTide Modem Interactions
Interactions between the PC and MDIC (Modem DMA/Interface Controller block inside the Controller) occur in two modes.
Programmed I/O (PIO) and DMA. Both of these methods are used with a either a 1-line or 2-line modem as handled by the
Modem Function (Function 1). In other words, whether the modem functionality includes the optional Modem DSP or not, PIO
and DMA modes will be used for data transfer between RipTide and the PC.
7.3.1.1
PIO
In the programmed I/O mode, the PC performs memory reads/writes to data port registers in the MDIC and in the additional
devices (optional Modem DSP) attached through the 8-bit parallel interface. The Host is the originator, sending data to the
Controller.
7.3.1.2
DMA
The second method is through DMA. Blocks of data can be transferred between PC memory and various devices connected
to the MDIC. Data is transferred from the MDIC block to the PC, and the source of the data is the Codec or the optional
Modem DSP device. DMAs across the PCI Bus occur in a bus master mode. The MDIC needs to be programmed with start
address, buffer size and a sample DWORD count (for IRQ generation) for each channel. A round-robin scheme rotates
between the various DMA channels.
7.3.2
Modem Support
There are two possible methods in supporting a 1-line modem in the RipTide system solution, either an MMX-based modem
or use of the optional Modem DSP device. As noted earlier, the RipTide system can also support a 2-line modem whereby
one modem is MMX-based and the other is sourced by the Modem DSP. If both modems are installed, the data handling for
either or both is done by the Modem Function (Function 1). There are 8 modem DMA channels with 4 channels assigned to
the MMX-based modem and 4 channels assigned to the Modem DSP device. The channels are used for transmit and receive
data, DSVD, and voice (handset) information.
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