Communicating print component

Abstract

A communicating print component a print head comprising a number of memory bits and a single lane analog bus conductively coupling the number of memory bits to a pad located on the exterior of the print head. The pad is to transmit an electrical signal from the number of memory bits, wherein the electrical signal indicates a combination of all selected bits of the number of memory bits.

What is claimed is: 
     
         1 . A print component comprising:
 a plurality of memory bits;   a first contact pad located on an exterior of the print component; and   a single lane analog bus conductively coupled to the plurality of memory bits;   wherein the first contact pad transmits an electrical signal from the plurality of memory bits, representing a parallel bit read of the plurality of memory bits, wherein the single electrical signal indicates the combination of the plurality of memory bits.   
     
     
         2 . The print component of  claim 1 , further comprising a fire pad is to connect to a fire line for firing nozzles of the print component. 
     
     
         3 . The print component of  claim 1 , wherein the print component is configured to read a combination of memory bits of the plurality of memory bits simultaneously through the single lane analog bus when the first contact is high. 
     
     
         4 . The print component of  claim 1 , wherein the combination of the plurality of memory bits is further selected using a memory access mode. 
     
     
         5 . The print component of  claim 4 , wherein the print component is configured to select the memory bits with the memory access mode enabled by using the same input primitive and address information as for firing the print component over a serial data path. 
     
     
         6 . The print component of  claim 4 , wherein the memory access mode is enabled by:
 writing a first enable bit in a configuration register for enabling the memory access mode;   loading a fire pulse group data for selecting one or more primitives;   transmitting a firing signal in a sequence to clear the configuration register; and   writing a second enable bit in the configuration register in response to transmitting the firing signal.   
     
     
         7 . The print component of  claim 6 , wherein loading the fire pulse group data comprises writing a bit along with setting a non-volatile memory enable bit in a fire pulse group data packet. 
     
     
         8 . The print component of  claim 4 , wherein the memory access mode is enabled by:
 writing a first enable bit in the configuration register for enabling the memory access mode;   loading a fire pulse group data for selecting one or more primitives; and   transmitting a firing signal in a sequence to clear the configuration register; and   writing a second enable bit in the configuration register in response to transmitting the firing signal.   
     
     
         9 . The print component of  claim 8 , wherein loading the fire pulse group data comprises writing a bit along with setting a non-volatile memory enable bit in a fire pulse group datapacket. 
     
     
         10 . The print component of  claim 1 , wherein the first contact pad is to connect to a printer-side contact. 
     
     
         11 . The print component of  claim 1 , wherein the first contact pad is an analog signal pad to communicate an analog signal. 
     
     
         12 . The print component of  claim 1 , wherein the first contact pad is a pad to communicate sensor states provided from a sensor, in addition to a memory bits signal transmitted responsive to the parallel bit read of the plurality of memory bits. 
     
     
         13 . A replaceable print head cartridge:
 a single sense contact pad to transmit an electrical signal based on a plurality of memory bits representing a read of a combination of memory bits of the plurality of memory bits in parallel; and   a single lane analog bus, wherein the electrical signal indicates the combination of the selected bits of the plurality of memory bits, wherein the singe lane analog bus is conductively coupled to the plurality of memory bits in parallel and to the single sense contact pad.   
     
     
         14 . The replaceable print head cartridge of  claim 13 , wherein the cartridge is configured to transmit the combination of the plurality of memory bits in parallel through the single sense contact pad when a line connected to a different contact pad is high. 
     
     
         15 . The replaceable print head cartridge of  claim 14 , wherein the different contact pad is to connect to a fire line for firing nozzles of the cartridge. 
     
     
         16 . The replaceable print head cartridge of  claim 13 , wherein the combination of the plurality of memory bits is further selected using a memory access mode enabled by programming a configuration register to address each of the combination of the plurality of memory bits to be selected. 
     
     
         17 . The replaceable print head cartridge of  claim 13 , wherein a first memory bit of the plurality of memory bits is located on a first silicon die and a second memory bit of the plurality of memory bits is located on a second silicon die. 
     
     
         18 . The replaceable print head cartridge of  claim 17 , wherein the first silicon die is associated with a first fluid type and the second silicon die is associated with a second fluid type different from the first fluid type. 
     
     
         19 . The replaceable print head cartridge of  claim 13 , comprising select logic to select the memory bits with the memory access mode enabled by using the same input primitive and address information as for firing the print component from the same serial data path. 
     
     
         20 . The replaceable print head cartridge of  claim 13 , wherein the single electrical signal from the plurality of memory is transmitted simultaneously by the single sense contact pad.