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ADSP-2192M

DSP Microcomputer

Analog Devices 

ADSP-2192M

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.

Table 21. Typical Configuration for ADSL Modem

End

Point

1

4

5

6

Type

BULK OUT

BULK IN

BULK OUT

INT IN

Max

Packet

64

64

64

16

Comment

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

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).

–20–

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