User`s guide

DWMBB Adapter
3.14.2 DWMBB/A Module Gate Array Transaction Register Files Testing
The DWMBB/A module gate array transaction register files (TRF) contain
I/O buffers and DMA buffers. The transaction register files have two
sections: the transmit registers and the receive registers. Both files
represent a total of 17 buffers, as shown in Figure 3–15 and Figure 3–16.
The DWMBB/A module is nonoperational if the I/O buffers fail. DMA
buffer failures are not fatal since there are two sets, the DMA-A buffer and
the DMA-B buffer. The DMA buffers are tested in either DMA loopback
mode or DWMBB/A module loopback mode. The diagnostic bits described
in Table 3–19 are used to test these buffers.
Figure 3–15 DWMBB/A Module Transmit Registers
ADDRESS BUFFERS
IM FADDR<3:0> = 1
IM FADDR<3:0> = 3
IM FADDR<3:0> = 4
IM FADDR<3:0> = 5
IM FADDR<3:0> = 6
IM FADDR<3:0> = 7
IM FADDR<3:0> = B
IM FADDR<3:0> = C
IM FADDR<3:0> = D
IM FADDR<3:0> = E
IM FADDR<3:0> = F
I/O DATA BUFFER
C/A BUFFER
msb−p096−89
DMA−A
C/A BUFFER
DMA−A LONGWORD DATA 1
DMA−A LONGWORD DATA 2
DMA−A LONGWORD DATA 3
DMA−A LONGWORD DATA 4
DMA−B
DMA−B LONGWORD DATA 1
DMA−B LONGWORD DATA 2
DMA−B LONGWORD DATA 3
DMA−B LONGWORD DATA 4
3–137