Motorola MSC8101 ADS User's Guide Page 155

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Operating in Different Data Transfer Modes
Host Interface (HDI16) 8-3
8.1.2 DSP-Side Model
To the SC140 core, the DSP-side registers appear as six registers mapped in the QBus
memory space, as indicated in Table 8-2, allowing MSC8101 instructions and addressing
modes to access these registers. Four 16-bit control registers provide the SC140 core
control of the HDI16 functionality, and two 64-bit data registers transfer the data.
8.2 Operating in Different Data Transfer Modes
The HDI16 offers two modes for transferring data between the host and the DSP. Normal
mode refers to non-DMA transfers, and DMA mode refers to transfers using an external
DMA controller (not be confused with the operation of the on-device DMA controller).
Table 8-1. Host-Side Programmer’s Model
Type Host Address Host-Side Register Mnemonic
Control 0x0 Interface Control Register ICR
0x1 Command Vector Register CVR
0x2 Interface Status Register ISR
0x3 Reserved
Data 0x4 Transmit/Receive Register 3 TX3/RX3
0x5 Transmit/Receive Register 2 TX2/RX2
0x6 Transmit/Receive Register 1 TX1/RX1
0x7 Transmit/Receive Register 0 TX0/RX0
Reset
Configuration
0x8 Reset Configuration Register 0 RSCFG0
0x9 Reset Configuration Register 1 RSCFG1
0xA Reset Configuration Register 2 RSCFG2
0xB Reset Configuration Register 3 RSCFG3
0xC–0xF Reserved
Table 8-2. DSP-Side Programmer’s Model
Type
Host Address
(HA[0–3])
Host-Side Register Mnemonic
Control 0x0000 Host Control Register HCR
0x0040 Host Status Register HSR
0x0060 Host Command Vector Register HCVR
0x0020 Host Port Control Register HPCR
Data 0x0080 Host Transmit Data FIFO HOTX
0x00A0 Host Receive Data FIFO HORX
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