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),
3.3 V +/-0.3V (I/O)

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

https://web.archive.org/web/19980710170103/http://semiconductor.hitachi.com/news/html/sega-dreamcast.html

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

https://web.archive.org/web/20000917162214fw_/http://www.hitachi.co.jp/Sicd/English/Products/asice.htm

https://web.archive.org/web/20010417103743fw_/http://www.hitachi.co.jp/Sicd/English/Products/prodlist/3205e.htm