U2739M-B Datasheet, PDF (20/69 Pages) ATMEL Corporation – DAB One-Chip Channel- and Source Decoder

U2739M-B
6.5.2 C-Bus / BOOT Bus Interface Description
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.
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 covers a subset of the C-Bus signals. The
user is able to download his own so-called ’User Software The BOOT bus is available in both package versions. The
Extensions’ using this bus system to replace or extend the timing diagram refers to the BOOT bus signals only.
6.5.3 BOOT Bus Timing Diagram
/BOOT_RE
C_ADD (13..0)
valid address
C_DATA (7..0)
valid data
tacc
Figure 10. C-bus interface timing diagram
valid address
valid data
6.5.4 BOOT Bus Timing Parameter
Parameter
BOOT ROM access time
Symbol Min.
Typ.
Max.
Unit
tacc
120
ns
20 (69)
Rev. A1, 22-May-01