TN-SH7-343A/E HD6417751BP167 HD6417751BP167I HD6417751F167 HD6417751F167I

DATE 18 July 2001 THEME PCIC specifications notice Spec change Supplement of Documents CLASSIFICATION PRODUCTNAME REFERENCE

HITACHI MICROCOMPUTER TECHNICAL UPDATE DATE 18 July 2001 THEME PCIC specifications notice Spec change Supplement of Documents CLASSIFICATION PRODUCTNAME REFERENCE DOCUMENTS No. TN-SH7-343A/E TN-SH7-343A/E Limitation on Use HD6417751BP167 HD6417751BP167, HD6417751BP167I HD6417751BP167I, HD6417751F167 HD6417751F167, HD6417751F167I HD6417751F167I HD6417751VF133 HD6417751VF133 Rev. SH7751 SH7751 Hardware Manual 1 Lot No.etc. EffectiveDate Eternity From ALL SH7751 SH7751 PCIC has some specifications NOT compliant with PCI Local Bus Specification, Revision 2.1. You have to take into consideration about following properties when you use SH7751 SH7751 as PCI non-host devises (e.g. add-in card for PC). (1) Although PCI2.1 says "all Base Address registers asking for I/O space may not request more than 256 bytes. ", the Base Address register in SH7751 SH7751 PCIC requests 1 megabyte for I/O space. There is a possibility that the PCI host devise considers SH7751 SH7751 as the forbidden PCI devise in device configuration process. (2) Although PCI2.1 says "the configuration command allows data to be accessed using any combination of bytes (including a byte, word, DWORD, or non-contiguous bytes). And the target is required to handle any combination of byte enables. ", SH7751 SH7751 PCIC ignores byte enables and only allows DWORD data to be accessed when it receives configuration commands. Then the configuration write access to SH7751 SH7751 in byte or word access rewrites unexpected part of the data. 1/1