Broadcom BCM5722 - Table 144: Device Capabilities Register (Offset 0 Xd4)

Programmer’s Guide BCM5722
10/15/07
Broadcom Corporation
Document 5722-PG101-R PCIe Capabilities Page 216
DEVICE CAPABILITIES REGISTER (OFFSET 0XD4)
This register defines operational characteristics that are globally applicable to this device.
Table 144: Device Capabilities Register (Offset 0xD4)
Bit Field Description Init Access
31:28 Reserved – 0RO
27:26 Captured Slot Power
Limit Scale
This value specifies the scale used for the Power Limit.
• 00 = 1.0x
• 01 = 0.1x
• 10 = 0.01x
• 11 = 0.001x
0RO
25:18 Captured Slot Power
Limit Value
This value specifies the upper limit on the power supplied for this device. 0 RO
17:15 Reserved – 0RO
14 Power Indicator
Present
When set to 1, this value indicates that a Power Indicator is implemented on
this device.
0R/W
a
13 Attention Indicator
Present
When set to 1, this value indicates that an Attention Indicator is implemented
for this device.
0R/W
12 Attention Button
Present
When set to 1, this value indicates that an Attention Button is implemented
for this device.
0R/Wa
11:9 Endpoint L1
Acceptable Latency
This value returns the latency that this device can accept when transitioning
from the L1 to the L0 state.
• 000 = Less than 1 µs
• 001 = 1 µs to less than 2 µs
• 010 = 2 µs to less than 4 µs
• 011 = 4 µs to less than 8 µs
• 100 = 8 µs to less than 16 µs
• 101 = 16 µs to less than 32 µs
• 110 = 32 µs to 64 µs
• 111 = Greater than 64 µs
7h R/Wa
8:6 Endpoint L0s
Acceptable Latency
This value returns the total latency that this device can accept when
transitioning from the L0s to L0 state.
• 000 = Less than 64 ns
• 001 = 64 ns to less than 128 ns
• 010 = 128 ns to less than 256 ns
• 011 = 256 ns to less than 512 ns
• 100 = 512 ns to less than 1 µs
• 101 = 1 µs to less than 2 µs
• 110 = 2 µs to 4 µs
• 111 = Greater than 4 µs
6h R/Wa
5 Extended Tag Field
Supported
This value returns the maximum supported tag field size when this function
acts as a requester.
• 0 = 5-bit tag field
• 1 = 8-bit tag field
1RO
4:3 Phantom Functions
Supported
This value is hardwired to 0 to indicate that this device only supports a single
function.
0RO