SH-4
| Sega Part No. | Manufacturer | Manufacturer Part No. | Name/Description | Extra |
| 315-1363-MP10 | Hitachi/ST/Renesas | HD6417091/HD6417091R/HD6417091RA | SH7091 MP10 W/O EVA | IC101 |
| 315-1398 | Hitachi/ST/Renesas | SH7091 W/O EVA | IC101 |
If I remember correctly EVA is in regards to some evaluation core, something like that?
https://www.hitachi.com/rev/1998/revaug98/r3_101.pdf
According to the service manual the 315-1398 has a 1.95v core and 3.3v I/O. The base SH-4 uses a 1.8v core but boosts it up to 1.95v for 200MHz.
Hitachi Releases HG74C
https://www.hitachi.com/New/cnews/E/1997/971002B.html
| Process | 0.25-micrometers CMOS process. Three to five metal layers |
| Power-supply voltage |
2.5 V +/- 10%
|
HG75C
https://www.hitachi.com/New/cnews/E/1998/980406B.html
http://www.hitachi.co.jp/New/cnews/9804/0406.html
| Process | 0.18-micrometer CMOS process. Three or five metal layers |
| Power-supply voltage |
1.8 V +/-0.2V (core), |
SH-4 7750 Announced November 1997
http://www.hitachi.com/New/cnews/E/1997/971110B.html
| Item | Specifications |
|---|---|
| Power supply voltage | 1.8 V (internal) / 3.3 V (I/O) |
| Operating frequency | 200 MHz and 167 MHz |
| Processing speed | 360 MIPS/200 MHz, 300MIPS/167 MHz 1.4 GFLOPS/200 MHz |
| Power consumption | 1.5 W (typ.) (at 200 MHz) |
| Cache configuration | 8 kB instructions/16 kB data |
| CPU | SH-4 |
| On-chip supporting functions | MMU, 4 DMAC channels, 2 serial channels, 3 timer channels, real-time clock, memory interface (DRAM/SRAM/synchronous DRAM/burst ROM/PCMCIA), etc. |
| Bus width | 64/32/16/8-bit data bus |
| Packages | 256-pin BGA (200 MHZ) and 208-pin HQFP (167MHz) |
| Process | 0.25-micrometer CMOS process |
Hitachi SH-4 Dreamcast Announcement
SH-4 7091 would have been made with technology somewhere between the HG74C and HG75C.
Links:
https://www.datasheetarchive.com/pdf/download.php?id=21cf0d789041f1e2863617ec2dd60b6d1e5f50
https://pdfs.semanticscholar.org/75ba/9e0e64672b0b0a8b1cbfe6f1b7821b311db0.pdf