摘要 |
An input buffer unit (51) stores commands and addresses in an input buffer (51a), and stores write data in a data buffer (56a). Also, an output buffer unit (55) stores commands in an output buffer (55a) and stores read data in the data buffer (56a). In other words, the input buffer unit (51) and output buffer unit (55) share a data buffer (56a). Also, the input buffer unit (51), output buffer unit (55), and data buffer unit (56) use a tag contained in a PIO request as an entry number when storing data respectively to the input buffer (51a), output buffer (55a) and data buffer (56a). |