Once Controller; Figure 10-3 Once Controller Block Diagram; Figure 10-4 Once Command Register - Motorola DSP56305 User Manual

10.4

OnCE CONTROLLER

The OnCE controller contains the following blocks: OnCE Command Register (OCR),
OnCE Decoder, and the status/control register. Figure 10-3 depicts the block diagram of
the OnCE controller.
ISBKPT
ISTRACE
ISDR
ISSWDBG
10.4.1 OnCE Command Register (OCR)
The OnCE Command Register (OCR) is an 8-bit shift register that receives its serial data
from the TDI signal. It holds the 8-bit commands to be used as input for the OnCE
Decoder. The OCR is shown in Figure 10-4.
OnCE Command
Reset = $00
MOTOROLA
OnCE Command Register
OnCE Decoder
ISDEBUG
Register Read

Figure 10-3 OnCE Controller Block Diagram

OCR
7 6
Register
R/W GO EX
Write Only

Figure 10-4 OnCE Command Register

DSP56305 User's Manual
Status and Control
Register Write
Mode Select
5 4 3 2 1
RS4 RS3 RS2 RS1 RS0
On-Chip Emulation Module
OnCE Controller
Update
Register
0
AA0106
TDI
TCK
TDO
AA0704
10-5