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Tx Descriptor Handler Memory Page Number - TDHMP (035FCh; R/W) — Intel
®
82575EB Gigabit
Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 439
Note: The queue depth field must be updated before the receive queues are enabled (before
writing to any CSR that controls the queues).
14.10.19 Tx Descriptor Handler Memory Page Number -
TDHMP (035FCh; R/W)
Note: The queue depth field must be updated before the receive queues are enabled (before
writing to any CSR that controls the queues).
Freeze 28 0b Stop Descriptor Handler
When set, the descriptor handler stops at the next stable point. This allows reading of
coherent values of all registers.
Reserved 29 0b Reserved
Queue Depth 31:30 00b Defines the number of descriptors (per queue) in the cache.
00b = 64 descriptors
01b = 32 descriptors
10b = 16 descriptors
11b = 8 descriptors
Field Bit(s)
Initial
Value
Description
Page 3:0 0h Tx Descriptor Handler Accessed Page (4KB)
Only allowed value for the 82575 is zero.
Reserved 27:4 0h Reserved
Freeze 28 0b Stop Descriptor Handler
When set, the descriptor handler stops at the next stable point. This allows reading of
coherent values of all registers.
Reserved 29 0b Reserved
Queue Depth 31:30 00b Defines the number of descriptors (per queue) in the cache.
00b = 64 descriptors
01b = 32 descriptors
10b = 16 descriptors
11b = 8 descriptors