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參數(shù)資料
| 型號(hào)： | ADSP-2192 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | DSP Microcomputer |
| 中文描述： | DSP微機(jī) |
| 文件頁數(shù)： | 20/40頁 |
| 文件大?。?/td> | 1307K |
| 代理商： | ADSP-2192 |
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ADSP-2192M
–20–
REV. 0
location specified by the USB REGIO (write) com-
mand. The driver must wait for each command to finish
before sending a new code download address.
5. If there is more code to be downloaded at a different
starting address, the driver begins the entire sequence
again, using steps 1–4.
General Comments:
DSP code download is only available after the ADSP-
2192M has re-enumerated using the MCU soft firmware.
The DSP code download command will not be available
in the MCU boot ROM for the default CONFIG device.
After setting the download addresses using the USB
REGIO (write) command, code download can be
initiated for any length using normal BULK traffic.
Example Initialization Process
After attachment to the USB bus, the ADSP-2192M identifies
itself as a CONFIG device with one endpoint, which refers to its
one control, EP0. This will cause a generic user-defined
CONFIG driver to load.
The CONFIG driver downloads appropriate MCU code to setup
the MCU, which includes the specific device descriptors, inter-
faces, and endpoints.
The external Serial EEPROM is read by the DSP and transferred
to the MCU. The CONFIG driver through the control EP0 pipe
generates a register read to determine the configuration value.
Based on this configuration code, the host downloads the proper
USB configurations to the MCU.
Finally, the driver writes the USB Control Register, causing the
device to disconnect and then reconnect so the new downloaded
configuration is enumerated by the system. Upon enumeration,
each interface loads the appropriate device driver.
An example of this procedure is configuring the ADSP-2192M
to be an ADSL modem and a FAX modem.
1. ADSP-2192M device is attached to USB bus. System
enumerates the CONFIG device in the ADSP-2192M
first. A user-defined driver is loaded.
2. The user-defined driver reads the device descriptor,
which identifies the card as an ADSL/FAX modem.
3. The user-defined driver downloads USB configuration
and MCU code to the MCU for interface 1, which is the
ADSL modem.
4. Configuration specifies which endpoints are used (and
their definitions). A typical configuration for ADSL
appears in
Table 21
.
5. The user-defined driver downloads USB configuration
for interface 2, which is the FAX modem. Configuration
specifies which endpoints are used and their definitions.
A typical configuration for FAX appears in
Table 22
.
6. The user-defined driver now writes the USB Config
Register, which causes the device to disconnect and
reconnect. The system enumerates all interfaces and
loads the appropriate drivers.
7. ADSL driver downloads code to DSP for ADSL service.
DSP also initializes the USB Endpoint Description Reg-
ister, DSP Memory Buffer Base Addr Register, DSP
Memory Buffer Size Register, DSP Memory Buffer RD
Pointer Offset, and DSP Memory Buffer WR Pointer
Offset registers for each endpoint. Endpoints can only be
used when these registers have been written. ADSL ser-
vice is now available.
8. FAX driver downloads code to DSP for FAX service.
DSP also initializes the USB Endpoint Description Reg-
ister, DSP Memory Buffer Base Addr Register, DSP
Memory Buffer Size Register, DSP Memory Buffer RD
Pointer Offset, and DSP Memory Buffer WR Pointer
Offset registers for each endpoint. Endpoints can only be
used when the above registers have been written. FAX
service is now available.
USB Data Pipe Operations
All data transactions involving the generic endpoints (4–11)
stream data into and out of the DSP memory via a dedicated USB
hardware block. This hardware block manages all USB transac-
tions for these endpoints and serves as a conduit for the data
moving to and from the DSP memory FIFOs. There is no MCU
involvement in the management of these data pipes.
The USB data FIFOs for these generic endpoints exist in DSP
memory space. The following memory buffer registers exist for
each endpoint:
Base Address (18 bits)
Size (16 bits) – Offset from the Base Address
Read Offset (16 bits) – Offset from the Base Address
Write Offset (16 bits) – Offset from the Base Address
As part of initialization, the DSP code sets up these FIFOs before
USB data transactions for these endpoints can begin. When
setting up these USB FIFOs, Base+Size/Read Offset/Write
Offset cannot be greater than 18 bits. DSP memory addresses
cannot exceed 18 bits (0x000000–0x03FFFF).
Table 21. Typical Configuration for ADSL Modem
End
Point
Type
Max
Packet
Comment
1
4
5
6
BULK OUT
BULK IN
BULK OUT
INT IN
64
64
64
16
DSP CODE
ADSL RCV
ADSL XMT
STATUS
Table 22. Typical Configuration for FAX Modem
End
Point
2
7
8
9
Type
BULK OUT
BULK IN
BULK OUT
INT IN
Max
Packet
64
64
64
16
Comment
DSP CODE
FAX RCV
FAX XMT
STATUS
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