Truth Table/Functionality
When the CONFIG_MODE
is set to
EXTENDED
, the altufm_spi
megafunction uses 16-bit word size for the address and data
word. Because the WIDTH_UFM_ADDRESS
parameter has a
maximum legal value of 9 address bits, you must pad the first 7
bits of an address word with 0
. The altufm_spi
megafunction discards the first 7 address bits. The 8th
address bit is the first MSB of the UFM address.
When the CONFIG_MODE
is set to BASE
,
the altufm_spi
megafunction uses 8-bit word size for the address and data
word and does not discard any address bits.
nCs |
sck |
si |
so |
---|---|---|---|
1 |
don't care |
don't care |
Z |
0 |
toggle |
serial input bits |
serial output bits |
Resource Usage when CONFIG_MODE =
"EXTENDED"
:
Mode |
Logic Cell |
UFM |
I/O |
---|---|---|---|
read/write |
131 |
1 |
4 |
read only |
39 |
1 |
4 |
Resource Usage when CONFIG_MODE =
"BASE"
:
Mode |
Logic Cell |
UFM |
I/O |
---|---|---|---|
read/write |
138 |
1 |
4 |
read only |
70 |
1 |
4 |