Copyright © Siemens AG 2016. All rights reserved
154
ERTEC 200P-2 Manual
Technical data subject to change
Version 1.0
DMA RAM:
Table 13: The DMA RAM address space.
The configuaration for ERTEC 200P is n = 255 and J = 31.
For this configuration the
internal DMA SRAM is organized in 1152 x 32 Bit
.
DMA Transfer Record – Source Address SRC_ADDR
Bit no.
Name
Description
31:0
SRC
Source Address
DMA Transfer Record – Destination Address DEST_ADDR
Bit no.
Name
Description
31:0
DEST
Destination Address
DMA Transfer Record – Transfer Control
Bit no.
Name
Description
Transfer 0
Transfer 1
Transfer 2
Transfer 3
Transfer n-1
Transfer n
Job stack 0
Job stack 1
Job stack j-1
Job stack j
Source Address
Destination Address
Transfer Control
Transfer Count
Base Address
Source Address Counter
Destination Address Counter
Transfer Control Information
Transfer Count Information
RAM Size = (n+1)*16+(j+1)*16 Byte
-- stack begins after last Transfer List entry:
stack_addr_s <= std_logic_vector(conv_unsigned (16*(LI1),13));
L
IS
T
_
S
IZ
E
(
0
..
n
)
Transfer record:
Transfer List
Job Stacks
16 Bytes