Hi08 Block Diagram - Motorola DSP56303 User Manual

receive path; the host-side receive data path (host reads) is also the DSP-side transmit path.
The Receive (RXH:RXM:RXL) and Transmit Data Registers (TXH:TXM:TXL) use the same
host address. During host writes to these addresses, the data is transferred to the Transmit
Data Registers while reads are performed from the Receive Data Registers.
Control Registers
HCR = Host Control Register
HSR = Host Status Register
HPCR = Host Port Control Register
HBAR = Host Base Address Register
24 24
HCR HSR
ISR ICR
8 8
Control Registers
ISR = Interface Status Register
ICR = Interface Control Register
CVR = Command Vector Register
IVR = Interrupt Vector Register
DSP-Side Registers
Core DMA Data Bus
DSP Peripheral Data Bus
24 24 24
HDDR HDR HBAR
Address
Comparator
3
CVR IVR Latch
8 8 8
HOST Bus
Host-Side Registers
Figure 6-1. HI08 Block Diagram
Host Interface (HI08)
Data Registers
HTX = Host Transmit Register
HRX = Host Receive Register
HDDR = Host Data Direction Register
HDR = Host Data Register
24 24
HPCR HTX
5
RXH RXM RXL
3 8 8 8
Data Registers
RXH = Receive Register High
RXM = Receive Register Middle
RXL = Receive Register Low
TXH = Transmit Register High
TXM = Transmit Register Middle
TXL = Transmit Register Low
Overview
24 24 24
HRX
24 24
TXH TXM TXL
8 8 8
DSP
Side
Host
Side
6-5