S1X60000 Datasheet, PDF (86/358 Pages) Epson Company – EMBEDDED ARRAY

Chapter 6 Memory Blocks
6.1.2 RAM Word/Bit Configuration and Simulation Model Selection
RAM delay parameters change depending on the word/bit structure. Simulation models
have been prepared using performance characteristics indicative to the RAM word/bit
configuration.
The 1 port RAM and 2 port RAM word/bit structure simulation models are shown in Tables
6-1 and 6-2 respectively.
For RAM with word/bit structures exceeding the limitations in the tables below, use
combinations of multiple RAMs.
Table 6-1 Simulation Model Selection Chart (1 port RAM Word/Bit Structure)
Word depth
16 to 64
Bit width
1 to 16
RAM1P1
17 to 32
RAM1P2
33 to 48
RAM1P3
49 to 64
RAM1P4
80 to 128 144 to 192 208 to 256 272 to 320 336 to 384 400 to 448 464 to 512
RAM1P5
RAM1P6
RAM1P7
RAM1P8
RAM1P9
RAM1P10
RAM1P11
RAM1P12
RAM1P13
RAM1P14
RAM1P15
RAM1P16
RAM1P17
RAM1P18
RAM1P19
RAM1P20
RAM1P21
RAM1P22
RAM1P23
RAM1P24
RAM1P25
RAM1P26
RAM1P27
RAM1P28
RAM1P29
RAM1P30
RAM1P31
RAM1P32
Table 6-2 Simulation Model Selection Chart (2 port RAM Word/Bit Structure)
Word depth
16 to 64
Bit width
1 to 16
RAM2P1
17 to 32
RAM2P2
33 to 48
RAM2P3
49 to 64
RAM2P4
80 to 128 144 to 192 208 to 256 272 to 320 336 to 384 400 to 448 464 to 512
RAM2P5
RAM2P6
RAM2P7
RAM2P8
RAM2P9
RAM2P10
RAM2P11
RAM2P12
RAM2P13
RAM2P14
RAM2P15
RAM2P16
RAM2P17
RAM2P18
RAM2P19
RAM2P20
RAM2P21
RAM2P22
RAM2P23
RAM2P24
RAM2P25
RAM2P26
RAM2P27
RAM2P28
RAM2P29
RAM2P30
RAM2P31
RAM2P32
6.1.3 RAM Size
The X direction size, Y direction size, and number of BCs used in the RAM are calculated
using the formulas below. The formulas below do not include the interconnect region
contained in the RAM.
(1) 1 port RAM
Size in the X direction: RX = 3 × Word/2 + 20
Size in the Y direction: RY = 2 × Bit + 12 (16 ≤ word ≤ 256)
RY = 2 × Bit + 13 (256 < word ≤ 512)
Number of BCs:
RAMBCS = RX × RY
Table 6-3 An Example of the Structure of 1 port RAM and Number of BCs
Bit width
Word depth
64
128
256
512
8
3,248 (116 × 28)
5,936 (212 × 28)
11,312 (404 × 28)
22,852 (788 × 29)
16
5,104 (116 × 44)
9,328 (212 × 44)
17,776 (404 × 44)
35,460 (788 × 45)
32
8,816 (116 × 76)
16,112 (212 × 76)
30,704 (404 × 76)
60,676 (788 × 77)
64
16,240 (116 × 140)
29,680 (212 × 140)
56,560 (404 × 140)
111,108 (788 × 141)
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