hi-6131pqtf QuickLogic Corp, hi-6131pqtf Datasheet - Page 172

• Manufacturer Part Number: hi-6131pqtf
• Description: Mil-std-1553 / Mil-std-1760 3.3v Bc / Mt / Rt Multi-terminal Device
• Manufacturer: QuickLogic Corp

Bit No. Mnemonic R/W Reset Function
7-4
8
3
2
1
0
PPON
CIR2ZN
STOPP
PPEN
CIR2EN
CIR1EN
0
0
0
0
0
0
Ping-Pong Enable Acknowledge.
This bit is controlled by the device and cannot be written by the host. It only
applies if PPEN bit 2 was initialized to logic one by the host after reset, en-
abling ping-pong buffer mode for this subaddress. Device logic asserts this bit
when it recognizes ping-pong is active for this subaddress. Before off-loading
the receive data buffer for this subaddress, the host can ask the device to
temporarily disable ping-pong by asserting STOPP bit 3. The device acknowl-
edges ping-pong is disabled by negating PPON. The host can safely off-load
the buffer without data collision while PPON is negated. After buffer servicing,
the host asks the device to re-enable ping-pong by negating STOPP bit 3. The
device acknowledges ping-pong is re-enabled by asserting PPON.
If PPEN bit 2 is high and PPON bit 8 is low when new commands arrive for
this subaddress, ping-pong is disabled. Each new message overwrites exist-
ing data in the buffer specified by DPB bit 10, and the DPB bit does not toggle
after command completion.
Circular Mode 2 Zero Number.
Used only in circular buffer mode 2, this 4-bit field is initialized with the number
of trailing zeros in the initialized MIBA address. This is explained in Section
XX, which fully describes circular buffer mode 2.
Stop Ping-Pong Request.
The host asserts this bit to suspend ping-pong buffering for this subaddress.
The host resets this bit to ask the device to re-enable ping-pong. The device
confirms recognition of ping-pong enable or disable status by writing PPON bit
8. Refer to Section XX, which fully describes ping-pong mode.
Ping-Pong, Circular Buffer Mode 2 or Circular Buffer Mode 1 Enable.
The PPEN, CIR2EN and CIR1EN bits are initialized by the host to select buffer
mode. The table below summarizes how buffer mode selection is encoded.
In the case of ping-pong, the host initializes the PPEN bit to logic one after
reset to enable ping-pong buffering for this subaddress. The host asserts
STOPP bit 3 to ask the device to temporarily disable ping-pong. Negating the
STOPP bit asks the device to re-enable ping-pong. The device confirms ping-
pong enable or disable state changes by writing the PPON bit.
HOLT INTEGRATED CIRCUITS
PPEN
1
0
0
0
HI-6130, HI-6131
172
Don’t Care
CIR2EN
1
0
0
Don’t Care
Don’t Care
CIR1EN
1
0
Circular Mode 2
Circular Mode 1
Indexed Single
Buffer Mode
Ping-Pong
Buffer