U2739M-BFC ATMEL [ATMEL Corporation], U2739M-BFC Datasheet - Page 20

• Manufacturer Part Number: U2739M-BFC
• Description: DAB One-Chip Channel- and Source Decoder
• Manufacturer: ATMEL [ATMEL Corporation]

6.5.2
The C-Bus is a multiplexed program as well as data bus
system to communicate with external components. The
complete bus system is available only in the QFP144
package version and needed for debugging the internal
OAK DSP core.
The BOOT bus covers a subset of the C-Bus signals. The
user is able to download his own so-called ’User Software
Extensions’ using this bus system to replace or extend the
6.5.3
6.5.4
U2739M-B
20 (69)
BOOT ROM access time
/BOOT_RE
C_ADD (13..0)
C_DATA (7..0)
C-Bus / BOOT Bus Interface Description
BOOT Bus Timing Diagram
BOOT Bus Timing Parameter
Parameter
tacc
valid address
Figure 10. C-bus interface timing diagram
valid data
Symbol
tacc
Atmel Wireless & Microcontrollers firmware. The
BOOT bus is a standard ROM interface (address/ data
buses, read enable line) and the read access is always with
16 wait states (referring the OAK internal 49.152 MHz
clock) to support slow devices.
The BOOT bus is available in both package versions. The
timing diagram refers to the BOOT bus signals only.
Min.
Typ.
valid address
valid data
Max.
120
Rev. A1, 22-May-01
Unit
ns