Adaptec 1737100 Programmer Manual - Page 39
Type 3, 32-bit Addressing Mode Frame Descriptor, Type 4, 32-bit Addressing Mode Frame Descriptor
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Transmit Architecture Table 3-5. Type 2 Transmit DMA Descriptor (64-bit Addressing) 31 24 23 16 15 8 7 0 Skip Field (multiple of 8 bytes) One Skip Field per Buffer ID = 4'b1011 I E C C Number Of Tx Buffers N N A R (valid only if first T DL C fragment) R TE CN P Reserved Low Address High Address Length (bytes) Type 3, 32-bit Addressing Mode (Frame Descriptor) This mode is currently not supported in the AIC-6915. Type 4, 32-bit Addressing Mode (Frame Descriptor) Type 4 enables the driver to execute a simple and fast copy of DOS and OS2 data structure (given by the upper layer software as a frame descriptor) to the descriptor queue area. The only difference is the location of 'Buffer Length' and 'Buffer Address'. 3-9
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3-9
Transmit Architecture
Type 3, 32-bit Addressing Mode (Frame Descriptor)
This mode is currently not supported in the AIC-6915.
Type 4, 32-bit Addressing Mode (Frame Descriptor)
Type 4 enables the driver to execute a simple and fast copy of DOS and OS2 data structure
(given by the upper layer software as a frame descriptor) to the descriptor queue area. The
only difference is the location of ‘Buffer Length’ and ‘Buffer Address’.
Table 3-5. Type 2 Transmit DMA Descriptor (64-bit Addressing)
31
24
23
16
15
8
7
0
Skip Field (multiple of 8 bytes)
One Skip Field per Buffer
ID =
4’b1011
I
N
T
R
E
N
D
C
A
L
T
C
P
C
R
C
E
N
Number Of Tx Buffers
(valid only if first
fragment)
Length (bytes)
Reserved
Low Address
High Address