Fujitsu MJA2500BH Maintenance Manual - Page 87
Outline of the Shadow Block Register, Table 5.3, Shadow Block Register
View all Fujitsu MJA2500BH manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 87 highlights
5.2 Logical Interface 5.2.2 Outline of the Shadow Block Register Each transport layer in the host system and device has a block register, which is called a Shadow Block Register in the host system, and a Block Register in the device. These registers are used when the host system issues a command to the device. Table 5.3 Shadow Block Register Command Block registers Read Write Data Port Error Features Sector Count (exp) Sector Count Sector Count (exp) Sector Count Sector Number (exp) Sector Number Sector Number (exp) Sector Number Cylinder Low (exp) Cylinder Low Cylinder Low (exp) Cylinder Low Cylinder High (exp) Cylinder High Cylinder High (exp) Cylinder High Device / Head Status Command Control Block registers Alternate Status Device Control Note: Each of the Sector Count, Sector Number, Cylinder Low, and Cylinder High fields has a higher-order field used for issuing the Ext command. The fields are called Sector Count exp, Sector Number exp, Cylinder Low exp, and Cylinder High exp, respectively. For information on writing data to these fields, see "Device Control Field." C141-E293 5-13