Operating Instructions
2-23
2
DMA Channels
The IBC supports seven DMA channels. These DMA channels are
allocated as follows:
Sources of Reset
The MVME1603/MVME1604 SBC has six equally powerful potential
sources of reset:
1. Power-on reset
2.
RESET
switch
3.
ALT_RST
∗
function controlled by the Port 92 register in the IBC
(resets the VMEbus when the MVME1603/MVME1604 is system
controller)
4. Keyboard Reset function from the keyboard controller in the
ISASIO (ISA Super I/O) device
5. Reset sources from the VMEchip2: the VMEbus
SYSRESET
∗
,
Watchdog Reset, and Software Reset functions.
Table 2-8. IBC DMA Channel Assignments
IBC
Priority
IBC Label
Controller
DMA Assignment
DMA
Request
Polarity
1
Channel 0
DMA1
Serial Port 3 Receiver (Z85230 Port A Rx)
High
2
Channel 1
Serial Port 3 Transmitter (Z85230 Port A Tx)
High
3
Channel 2
Reserved for Floppy Drive Controller
High
4
Channel 3
Parallel Port
High
5
Channel 4
DMA2
Not available - Cascaded from DMA1
N/A
6
Channel 5
Serial Port 4 Receiver (Z85230 Port B Rx)
High
7
Channel 6
Serial Port 4 Transmitter (Z85230 Port B Tx)
High
8
Channel 7
Not Used
High
Summary of Contents for MVME1603
Page 1: ...MVME1603 MVME1604 Single Board Computer Installation and Use V1600 1A IH4 ...
Page 14: ...xiv ...
Page 156: ...Using the Debugger 5 8 5 ...
Page 176: ...ENV Set Environment 6 20 6 ...
Page 190: ...EMC Compliance B 4 B ...
Page 200: ...Proper Grounding C 10 C ...
Page 222: ......