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iCE40 DSP Block

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Tim Ansell edited this page Oct 28, 2018 · 3 revisions

Table 3. Instantiation Guide

Port Name Input / Output 8x8 Multiplier 16x16 Multiplier 16x16 Accumulate 32x32 Accumulate 16x16 Adder/Subtractor 32x32 Adder/Subtractor 8x8 MAC 16x16 MAC
ACCUMCI Input Default Default Bottom Signal Default -> Bottom Default -> Signal Default -> Bottom Default -> Signal
ADDSUBTOP Input Default Default 0 0 0=Add, 1=Sub 0=Add, 1=Sub 0 0
AHOLD Input Signal Signal Top -> Signal Signal Top -> Signal Signal Signal Signal
A[15:8] Input Top Signal Top Signal Top Signal Top Signal
A[7:0] Input Bottom Signal Top Signal Top Signal Bottom Signal
BHOLD Input Signal Signal Bottom -> Signal Signal Bottom -> Signal Signal Signal Signal
B[15:8] Input Top Signal Bottom Signal Bottom Signal Top Signal
B[7:0] Input Bottom Signal Bottom Signal Bottom Signal Bottom Signal
CE Input Signal Signal Signal Signal Signal Signal Signal Signal
CHOLD Input Default Default Default -> Top Default -> Signal Top Default -> Signal Top Signal
CI Input Default Default Default Default Bottom Signal Default Default
CLK Input Signal Signal Signal Signal Signal Signal Signal Signal
C[15:0] Input Default Default Default -> Top Default -> Signal Top Default -> Signal Top Signal
DHOLD Input Default Default Default -> Bottom Default -> Signal Bottom Default -> Signal Bottom Signal
D[15:0] Input Default Default Default -> Bottom Default -> Signal Bottom Default -> Signal Bottom Signal
IRSTBOT Input Bottom -> Signal Signal Bottom -> Signal Signal Bottom -> Signal Signal Bottom -> Signal Signal
IRSTTOP Input Top -> Signal Signal Top -> Signal Signal Top -> Signal Signal Top -> Signal Signal
OHOLDBOT Input Bottom -> Default Signal -> Default Bottom Signal Bottom Signal Bottom Signal
OHOLDTOP Input Top -> Default Signal -> Default Top Signal Top Signal Top Signal
OLOADBOT Input Default Default Signal Signal 0 0 Signal Signal
OLOADTOP Input Default Default Signal Signal 0 0 Signal Signal
ORSTBOT Input Bottom Signal Bottom Signal Bottom Signal Bottom Signal
ORSTTOP Input Top Signal Top Signal Top Signal Top Signal
SIGNEXTIN Input Default Default Bottom Signal Bottom Signal Default -> Bottom Default -> Signal
ACCUMCO Output Default Default Top Signal Default -> Top Default -> Signal Default -> Top Default -> Signal
CO Output Default Default Default -> Top Default -> Signal Top Signal Default -> Top Default -> Signal
OUTPUT[15:0] Output Bottom Signal Bottom Signal Bottom Signal Bottom Signal
OUTPUT[31:16] Output Top Signal Top Signal Top Signal Top Signal
SIGNEXTOUT Output Default Default Top Signal Top Signal Default -> Top Default -> Signal
ADDSUBBOT Input ????????????????? ???????????????? ?????????????????? ?????????????????? ?????????????????????? ?????????????????????? ????????????????? ?????????????????
0=Add, 1=Sub 0=Add, 1=Sub 0 0 0=Add, 1=Sub 0=Add, 1= Sub 0=Add, 1=Sub 0 0

Compare too;

DSP: Preliminary Mapping  Report (see note below)
+------------+------------------+--------+--------+--------+--------+--------+------+------+------+------+-------+------+------+                                                                                                             
|Module Name | DSP Mapping      | A Size | B Size | C Size | D Size | P Size | AREG | BREG | CREG | DREG | ADREG | MREG | PREG |                          
+------------+------------------+--------+--------+--------+--------+--------+------+------+------+------+-------+------+------+                                                                                                             
|lm32_cpu    | A2*B2            | 18     | 16     | -      | -      | 48     | 1    | 1    | -    | -    | -     | 0    | 0    |                          
|lm32_cpu    | (PCIN>>17)+A2*B2 | 16     | 16     | -      | -      | 48     | 1    | 1    | -    | -    | -     | 0    | 1    |                                                                                                             
|lm32_cpu    | A2*B2            | 18     | 18     | -      | -      | 48     | 1    | 1    | -    | -    | -     | 0    | 0    |                          
|lm32_cpu    | (PCIN>>17)+A2*B2 | 18     | 16     | -      | -      | 48     | 1    | 1    | -    | -    | -     | 0    | 1    |                                                                                                             
+------------+------------------+--------+--------+--------+--------+--------+------+------+------+------+-------+------+------+   


|5     |DSP48E1    |     2|
|6     |DSP48E1_1  |     1|
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