IDT 89HPES16T4G2, Preliminary User'S Manual

Page: 102 / 149

IDT Configuration Registers
PES16T4G2 User Manual 8 - 24 January 28, 2013
Notes
PCIELCTL - PCI Express Link Control (0x050)
21 LBN RWL Upstream:
0x0
Down-
stream:
0x1
Link Bandwidth Notification Capability. When set, this bit
indicates support for the link bandwidth notification status and
interrupt mechanisms. The PES16T4G2 downstream ports
support the capability.
This field is not applicable for the upstream port and must be
zero.
23:22 Reserved RO 0x0 Reserved field.
31:24 PORTNUM RO Port 0: 0x0
Port 2: 0x2
Port 4: 0x4
Port 6: 0x6 Port Number. This field indicates the PCI express port num-
ber for the corresponding link.
Bit
Field
Field
Name
Type Default
Value
Description
1:0 ASPM RW 0x0 Active State Power Management (ASPM) Control. This field
controls the level of ASPM supported by the link. The initial
value corresponds to disabled. The value contained in Serial
EEPROM may override this default value
0x0 - (disabled) disabled
0x1 - (l0s) L0s enable entry
0x2 - (l1) L1 enable entry
0x3 - (l0sl1) L0s and L1 enable entry
Note that “L0s enable entry” corresponds to the transmitter
entering L0s (the receiver supports this function and is not
affected by this setting).
2 Reserved RO 0x0 Reserved field.
3 RCB RO 0x0 Read Completion Boundary. This field is not applicable and is
hardwired to zero.
4 LDIS RW 0x0 Link Disable. When set in a downstream port, this bit disables
the link.
This field is not applicable for the upstream port and must be
zero.
Bit
Field
Field
Name
Type Default
Value
Description